Protective tube fitting, negative pressure connecting nozzle mounting assembly and endoscope

Abstract

The utility model discloses a sheath pipe fitting, a negative pressure connecting nozzle mounting assembly and an endoscope, and relates to the technical field of medical instruments. The two ends of the protective sleeve pipe are arranged to be of a through structure, the first limiting structure is arranged in the protective sleeve pipe and used for limiting the rotating angle of the negative pressure connecting nozzle when the negative pressure connecting nozzle is arranged in the protective sleeve pipe in a sleeved mode, and the protective sleeve pipe is further provided with the first positioning structure used for being matched with the shell. The protective sleeve pipe can be fixed relative to the shell, the negative pressure connecting nozzle sleeved with the protective sleeve pipe can reduce axial swing under limitation of the protective sleeve pipe, even if the negative pressure connecting nozzle axially swings, the negative pressure connecting nozzle can be absorbed by the surface of the protective sleeve, then force transmitted to the shell in the swinging process of the negative pressure connecting nozzle is reduced, and the service life of the negative pressure connecting nozzle is prolonged. Therefore, the possibility that the shell is jacked open in the swinging process of the negative pressure connecting nozzle is avoided or reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a sheath pipe, a negative pressure connection nozzle mounting assembly and an endoscope. BACKGROUND

[0002] In an endoscope with a negative pressure connection nozzle, the negative pressure connection nozzle is used to connect an external negative pressure pipeline and cooperate with an instrument channel in the endoscope to suck lesions in a patient's body.

[0003] Some existing endoscopes have the ability to rotate the negative pressure connection nozzle, which can adjust the orientation and placement of the negative pressure pipeline. Considering the interference problem of the negative pressure connection nozzle with other structures such as buttons and wire harnesses, it is usually necessary to limit the rotation range thereof. In the related art, for example, JP2023143421A sets a limiting rotation structure on the negative pressure connection nozzle and the handle shell, respectively.

[0004] However, due to the limiting rotation structure, the handle shell is easily pushed open in the existing scheme of stopping rotation of the negative pressure connection nozzle by the handle shell, which not only hinders the use of the operator, but also causes harm to the patient undergoing surgery. CONTENT OF THE INVENTION

[0005] The present application discloses a sheath pipe, a negative pressure connection nozzle mounting assembly and an endoscope to at least partially improve the above technical problems.

[0006] To solve the above problems, the present application adopts the following technical solutions:

[0007] On the one hand, the present application provides a sheath pipe, both ends of which are through and used for sleeving an outer periphery of a negative pressure connection nozzle, a first limiting structure is arranged in the sheath pipe, the first limiting structure is used for limiting a rotation angle of the negative pressure connection nozzle in the sheath pipe, and the sheath pipe is further provided with a first positioning structure used for cooperating with a shell to be fixed.

[0008] In an embodiment, the first positioning structure is arranged on an outer surface of the shell and is used for cooperating with the shell to be fixed in a first direction.

[0009] And / or, a third positioning structure is further arranged on an outer surface of the sheath pipe, and the third positioning structure is used for cooperating with the shell to be fixed in a second direction.

[0010] In an embodiment, the first positioning structure is arranged on an outer surface of the shell and is used for cooperating with the shell to be fixed in a first direction, a third positioning structure is further arranged on an outer surface of the sheath pipe, and the third positioning structure is used for cooperating with the shell to be fixed in a second direction, and the first direction and the second direction have an included angle.

[0011] In an embodiment, the first limiting structure protrudes from the inner surface of the sheath pipe, the first positioning structure protrudes from the outer surface of the sheath pipe, and the first limiting structure and the first positioning structure are oppositely arranged on the inner and outer surfaces of the sheath pipe.

[0012] In another aspect, the embodiments of the present application also provide a negative pressure connection nozzle mounting assembly, which comprises a negative pressure connection nozzle and a sheath pipe as described above, one end of the negative pressure connection nozzle is rotatably sleeved in the sheath pipe, and one end of the negative pressure connection nozzle is provided with a second limiting structure matched with the first limiting structure.

[0013] In an embodiment, the negative pressure connection nozzle further has a fourth limiting structure for cooperating with the shell and limiting the telescopic movement of the negative pressure connection nozzle relative to the shell.

[0014] In an embodiment, the negative pressure connection nozzle mounting assembly further comprises a shell, which comprises oppositely arranged and detachably connected first and second shells, and the first and second shells jointly form an installation cavity and a third limiting structure matched with the fourth limiting structure after being spliced.

[0015] The first and second shells are both provided with second positioning structures matched with the first positioning structure, the first positioning structure is arranged on the outer surface of the sheath pipe and extends in a first direction, and the first positioning structure is abutted and clamped between the two second positioning structures.

[0016] The sheath pipe is arranged in the installation cavity, and the outer surface of the sheath pipe is further provided with a third positioning structure.

[0017] The other end of the negative pressure connection nozzle extends out of the installation cavity, the first shell and / or the second shell is provided with a fourth positioning structure matched with the third positioning structure, and the third and fourth positioning structures are matched with pin holes.

[0018] In an embodiment, the inside of the first shell is formed with a first structure part and a second structure part, the first structure part and the second structure part are arranged in intersection on a splicing surface perpendicular to the first shell and the second shell, and the second positioning structure is connected to the first structure part and the second structure part.

[0019] In an embodiment, when the inside of the shell is provided with a wire harness extending out of the shell, the distal end of the negative pressure connection nozzle is away from the wire harness extending out of the shell in the process of rotation.

[0020] When the first limiting structure and the second limiting structure limit the negative pressure connection nozzle, a proximal end of the negative pressure connection nozzle is away from a surface of the second shell away from the first shell; or, when the first limiting structure and the second limiting structure limit the negative pressure connection nozzle, the proximal end of the negative pressure connection nozzle is away from the surface of the first shell away from the second shell.

[0021] In another aspect, the embodiment of the present application also provides an endoscope, which comprises the negative pressure connection nozzle mounting assembly as described above.

[0022] The technical scheme adopted by the present application can achieve the following beneficial effects:

[0023] The sheath pipe provided by the embodiment of the present application is provided with a through structure at both ends of the sheath pipe, and a first limiting structure is arranged in the sheath pipe. The first limiting structure is used to limit the rotation angle of the negative pressure connection nozzle when the negative pressure connection nozzle is sleeved in the sheath pipe. The sheath pipe is also provided with a first positioning structure for cooperating with the shell. The sheath pipe can be fixed relative to the shell. The negative pressure connection nozzle sleeved in the sheath pipe can reduce axial swing under the limitation of the sheath pipe. Even if the negative pressure connection nozzle swings axially, since the sheath pipe can increase the constraint area in the axial swing direction of the negative pressure connection nozzle, the force generated in the axial swing direction of the negative pressure connection nozzle can be absorbed by the surface of the sheath pipe, thereby reducing the force transmitted to the shell by the negative pressure connection nozzle during swing, and thereby avoiding or reducing the possibility of the shell being pushed open during swing of the negative pressure connection nozzle. The aforementioned sheath pipe can also solve the aforementioned problems when applied to the negative pressure connection nozzle mounting assembly and the endoscope. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 A structure schematic diagram of an endoscope in an embodiment of the present application is shown;

[0026] Figure 2 An exploded view of a negative pressure connection nozzle mounting assembly in an embodiment of the present application is shown;

[0027] Figure 3 A partial structure schematic diagram of a negative pressure connection nozzle mounting assembly in an embodiment of the present application is shown;

[0028] Figure 4 For Figure 3An enlarged view of the middle A;

[0029] Figure 5 A structural schematic view of a negative pressure connection nozzle in a negative pressure connection nozzle mounting assembly in an embodiment of the present application is shown;

[0030] Figure 6 A structural schematic view of another view of a negative pressure connection nozzle in a negative pressure connection nozzle mounting assembly in an embodiment of the present application is shown;

[0031] Figure 7 A structural schematic view of a sheath pipe fitting in an embodiment of the present application is shown;

[0032] Figure 8 A structural schematic view of another view of a sheath pipe fitting in an embodiment of the present application is shown.

[0033] In the figure: 1, endoscope; 10, negative pressure connection nozzle mounting assembly; 110, negative pressure connection nozzle; 111, second limiting structure; 112, fourth limiting structure; 120, sheath pipe fitting; 122, first limiting structure; 123, first positioning structure; 124, third positioning structure; 130, outer shell; 131, first shell; 1311, first structure part; 1312, second structure part; 132, second shell; 133, mounting cavity; 134, second positioning structure; 135, fourth positioning structure; 137, third limiting structure; 20, wire harness. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0035] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0036] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. The end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "distal end".

[0037] The inventive concept of this application is described here:

[0038] In endoscopes with negative pressure connection nozzles, the negative pressure connection nozzles are used to connect to external negative pressure lines and work in conjunction with the instrument channels in the endoscope to aspirate lesions from the patient's body.

[0039] Some existing endoscopes have the ability to rotate the negative pressure connector, which allows adjustment of the orientation and placement of the negative pressure tubing. Considering the interference between the negative pressure connector and other structures (such as buttons and wiring harnesses), it is usually necessary to limit its rotation range. In related technologies, such as JP2023143421A, corresponding limit and anti-rotation structures are set on the negative pressure connector and the handle housing, respectively.

[0040] However, due to the setting of the limiting anti-rotation structure, in the existing scheme of preventing the negative pressure connecting nozzle from rotating through the handle shell, the handle shell is easily pushed open. This is not only inconvenient for the operator to use, but also poses a risk to the patient undergoing surgery.

[0041] The inventors discovered that the handle shell is easily pushed open mainly because the negative pressure connector is in direct contact with the handle shell. During the rotation of the handle shell, the point of contact between the negative pressure connector and the handle shell is used as a fulcrum. The negative pressure connector and the handle shell form a lever structure, so the handle shell is easily pushed open during the rotation of the negative pressure connector.

[0042] Based on this, the inventor proposed to eliminate the aforementioned lever structure or reduce the impact of the aforementioned lever structure on the handle shell, which would solve the aforementioned problem. Therefore, the inventor proposed a protective sleeve fitting, which is fitted around the outer periphery of the negative pressure connector, so that the force transmitted from the negative pressure connector to the handle shell is absorbed and dispersed by the protective sleeve fitting. This can avoid or reduce the possibility that the negative pressure connector will push the handle shell open during rotation.

[0043] The following is in conjunction with the appendix Figures 1 to 8 The application provides a detailed description of the sheath fitting 120, the negative pressure connector mounting assembly 10, and the endoscope 1 through specific embodiments and application scenarios.

[0044] Please also refer to Figures 1-3The endoscope 1 can include a negative pressure connection nozzle mounting assembly 10 and a wire harness 20 for connecting external devices such as a display, a processor, and the like. It should be noted that the endoscope 1 involved in the embodiments of the present application can be a bronchoscope, a nephroscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a nasoscope, an oral mirror, a laryngoscope, a colposcope, a laparoscope, an arthroscope, and the like, and the embodiments of the present application do not specifically limit the type of endoscope.

[0045] The negative pressure connection nozzle mounting assembly 10 can include a sheath pipe 120, a negative pressure connection nozzle 110, and a shell 130. The wire harness 20 can be arranged in the shell 130 and partially extend out of the shell 130 to facilitate connection with external devices. The shell 130 is internally formed with a mounting cavity 133. The negative pressure connection nozzle 110 is rotatably sleeved in the sheath pipe 120 and arranged in the mounting cavity 133. Part of the negative pressure connection nozzle 110 extends out of the mounting cavity 133 to facilitate external connection of a negative pressure device. In the embodiment, the sheath pipe 120 is arranged in the mounting cavity 133 and fixedly connected with the shell 130 to constrain swinging of the negative pressure connection nozzle 110. It should be noted that the constraint can be understood as not complete restriction, for example, the swinging amplitude of the negative pressure connection nozzle 110 can be reduced.

[0046] Specifically, please refer to Figure 2 and Figure 3 In the embodiment, the shell 130 can include a first shell 131 and a second shell 132 which are detachably connected. The first shell 131 and the second shell 132 jointly enclose the mounting cavity 133 after being spliced, and the first shell 131 and the second shell 132 can jointly enclose a third limiting structure 137 after being spliced. The third limiting structure 137 can be used to limit extension and retraction of the negative pressure connection nozzle 110 relative to the shell 130, so that the negative pressure connection nozzle 110 can be prevented from being pulled out of the shell 130, and the negative pressure connection nozzle 110 can also be prevented from being detached from the sheath pipe 120.

[0047] Please refer to Figures 4-6 To match the third limiting structure 137, the negative pressure connection nozzle 110 can be provided with a fourth limiting structure 112 in an embodiment. The embodiments of the present application do not specifically limit the specific forms of the third limiting structure 137 and the fourth limiting structure 112. For example, in an embodiment, the third limiting structure 137 can be a limiting hole, and the fourth limiting structure 112 can be a limiting groove. The limiting groove on the negative pressure connection nozzle 110 can be embedded in the limiting hole of the shell 130 to limit movement of the negative pressure connection nozzle 110 in the axial direction of the limiting hole.

[0048] It should be noted that the present embodiment does not limit the forming manner of the limiting groove. For example, in one embodiment, the limiting groove can be formed by the surface recess of the negative pressure connecting nozzle 110. For another example, in another embodiment, the limiting groove can be formed by the area between the two protrusions arranged on the surface of the negative pressure connecting nozzle 110. Further, in this embodiment, the two protrusions mentioned above can be movably arranged relative to the surface of the negative pressure connecting group. For example, in the process of installing the negative pressure connecting nozzle 110, the protrusion to be placed in the installation cavity 133 can be fixed first, and then the protrusion outside the installation cavity 133 can be fixed after the negative pressure connecting nozzle 110 is installed in the shell 130. In this way, the connection between the negative pressure connecting nozzle 110 and the shell 130 can be more close, and thus the probability of swinging of the negative pressure connecting nozzle 110 can be reduced. The specific manner can be set according to the actual situation.

[0049] Please refer to Figure 4 , Figure 7 and Figure 8 , the sheath pipe 120 can be arranged in a structure with both ends penetrating through, and the inside of the sheath pipe 120 can be provided with a first limiting structure 122, which can be used to limit the rotation angle of the negative pressure connecting nozzle 110 in the sheath pipe 120. To match, one end of the negative pressure connecting nozzle 110 can be provided with a second limiting structure 111 cooperating with the first limiting structure 122. It should be noted that the present embodiment does not limit the specific form of the first limiting structure 122 and the second limiting structure 111. For example, in the present embodiment, the first limiting structure 122 and the second limiting structure 111 can both be limiting blocks. When the two limiting blocks abut against each other, the limiting effect can be achieved. At this time, the negative pressure connecting nozzle 110 cannot continue to rotate in one direction, but can only rotate in the opposite direction to the previous rotation direction, so as to achieve the limiting effect in one rotation direction.

[0050] In a more specific embodiment, the distal end of the negative pressure connecting nozzle 110 always faces away from the wire harness 20 extending from the shell 130 during the rotation of the negative pressure connecting nozzle 110 relative to the shell 130, so as to avoid the interference of the wire harness 20 with the negative pressure connecting nozzle 110. That is, in the present embodiment, the area swept by the distal end of the negative pressure connecting nozzle 110 during the rotation of the negative pressure connecting nozzle 110 relative to the shell 130 does not coincide with the area where the wire harness 20 is located. Exemplarily, in the present embodiment, the rotation angle of the negative pressure connecting nozzle 110 relative to the shell 130 can be 180°, and when the first limiting structure 122 and the second limiting structure 111 limit the negative pressure connecting nozzle 110, the proximal end of the negative pressure connecting nozzle 110 can face away from the surface of the first shell 131 away from the second shell 132, or the proximal end of the negative pressure connecting nozzle 110 can face away from the surface of the second shell 132 away from the first shell 131 when the first limiting structure 122 and the second limiting structure 111 limit the negative pressure connecting nozzle 110.

[0051] As described above, in an embodiment, the sheath pipe 120 can be provided with a first positioning structure 123 for cooperating with the shell 130, and the sheath pipe 120 can be fixed to the shell 130 through the first positioning structure 123. To match this, in an embodiment, the shell 130 can have a second positioning structure 134, specifically, the second positioning structure 134 can be provided on the first shell 131 and the second shell 132. The present embodiment also does not limit the specific form of the first positioning structure 123 and the second positioning structure 134. For example, in an embodiment, the first positioning structure 123 can be a sheet structure and protrude outward from the outer surface of the sheath pipe 120, and the second positioning structure 134 can also be a sheet structure. When the sheath pipe 120 is fixed to the shell 130, the first positioning structure 123 can be clamped between two second positioning structures 134 to achieve the relative fixation of the sheath pipe 120 and the shell 130.

[0052] Please continue to refer to Figure 7 and Figure 8 As described above, the first positioning structure 123 protrudes outward from the outer surface of the sheath pipe 120, and the first limiting structure 122 protrudes inward from the inner surface of the sheath pipe 120. Since the first limiting structure 122 will be subjected to dynamic load during the stopping of the sheath pipe 120, the first limiting structure 122 will be subjected to a larger force. In an embodiment, the first positioning structure 123 and the second positioning structure 134 can be arranged opposite to each other on the inner and outer surfaces of the sheath pipe 120, so that the cross-sectional area of the sheath pipe 120 at this cross section is larger, thereby enabling the sheath pipe 120 to withstand a larger force at this position, thereby avoiding or reducing the possibility of the shell 130 being pried open.

[0053] Further, please refer to Figure 4 In an embodiment, the inner part of the first shell 131 can further be formed with a first structure part 1311 and a second structure part 1312, wherein the extending directions of the first structure part 1311 and the second structure part 1312 can be arranged to intersect, for example, on a plane perpendicular to the joint surface of the first shell 131 and the second shell 132, the first structure part 1311 and the second structure part 1312 can be arranged to intersect, and the specific shape of the first structure part 1311 and the second structure part 1312 is not limited in the embodiments of the present application, for example, it can be a branch plate structure, or an arc plate structure, etc., and the specific shape can be arranged according to actual conditions. The second positioning structure 134 can be connected to the first structure part 1311 and the second structure part 1312.

[0054] As mentioned above, since the first positioning structure 123 will be subjected to a large force during the process of stopping the sheath pipe 120, the second positioning structure 134 will also be subjected to a large force transmitted by the first positioning structure 123. The arrangement of the second positioning structure 134 mentioned above can make the second positioning structure 134 more closely connected to the first shell 131, thereby avoiding or reducing the possibility of damage to the second positioning structure 134. At the same time, the structure of the second structure part 1312 can also increase the contact area between the second structure part 1312 and the first shell 131, thereby making the force transmitted by the second structure part 1312 to the first shell 131 be shared, thereby reducing the size of the force received by the local shell, and thereby avoiding or reducing the possibility of the shell 130 being pried open.

[0055] It can be understood that, similarly, the inner part of the second shell 132 can also be formed with a first structure part 1311 and a second structure part 1312, and the cooperation mode between the first positioning structure 123 and the second shell 132 can refer to the cooperation mode between the first positioning structure 123 and the first shell 131, which will not be repeated here.

[0056] Please refer to Figure 2 , Figure 7 and Figure 8 , further, in an embodiment, the outer surface of the sheath pipe 120 can be further provided with a third positioning structure 124, which can also be used for fixing the shell 130. To match it, in an embodiment, the shell 130 can have a fourth positioning structure 135 matching the third positioning structure 124.

[0057] As described above, in the embodiment, the first positioning structure 123 and the second positioning structure 134 can position the sheath pipe 120 and the shell 130 in a first direction, and the third positioning structure 124 and the fourth positioning structure 135 can position the sheath pipe 120 and the shell 130 in a second direction, and the first direction and the second direction have an included angle, so that the positioning mode between the sheath pipe 120 and the shell 130 is more comprehensive, and the stability of the connection between the sheath pipe 120 and the shell 130 can be improved. Since the negative pressure connection nozzle 110 is sleeved in the sheath pipe 120, the above structure can make it more difficult for the negative pressure connection nozzle 110 to push open the shell 130.

[0058] It can be understood that the embodiment of the present application also does not limit the specific form of the third positioning structure 124 and the fourth positioning structure 135. For example, in an embodiment, the third positioning structure 124 and the fourth positioning structure 135 can be a pin hole cooperation, that is, the third positioning structure 124 can be a positioning pin, and the fourth positioning structure 135 can be a positioning hole. It should be noted that the embodiment of the present application does not limit the specific number of the third positioning structure 124 and the fourth positioning structure 135. Therefore, in some embodiments, part of the third positioning structure 124 can be a positioning pin, and the fourth positioning structure 135 matched therewith can be a positioning hole, and another part of the third positioning structure 124 can be a positioning hole, and the fourth positioning structure 135 matched therewith can be a positioning pin. The specific setting can be made according to the actual situation.

[0059] In summary, the sheath pipe 120 provided by the embodiment of the present application has the following advantages. The two ends of the sheath pipe 120 are provided in a through structure, and the first limiting structure 122 is arranged in the sheath pipe 120. The first limiting structure 122 is used to limit the rotation angle of the negative pressure connecting nozzle 110 when the negative pressure connecting nozzle 110 is sleeved in the sheath pipe 120. The sheath pipe 120 is further provided with the first positioning structure 123 used to cooperate with the shell 130. The sheath pipe 120 can be fixed relative to the shell 130. The negative pressure connecting nozzle 110 sleeved in the sheath pipe 120 can reduce the axial swing under the limitation of the sheath pipe 120. Even if the negative pressure connecting nozzle 110 swings axially, the force generated in the axial swing direction of the negative pressure connecting nozzle 110 can be absorbed by the surface of the sheath pipe 120 because the sheath pipe 120 can increase the constraint area in the axial swing direction of the negative pressure connecting nozzle 110. Therefore, the force transmitted to the shell 130 by the negative pressure connecting nozzle 110 in the swing process is reduced. That is, in the embodiment of the present application, the contact area of the negative pressure connecting nozzle 110 in the swing process is larger than the contact area of the negative pressure connecting nozzle 110 directly contacting the shell 130. Therefore, the influence of the aforementioned lever structure on the shell 130 is reduced, and the possibility of the shell 130 being pushed open in the swing process of the negative pressure connecting nozzle 110 is avoided or reduced. The sheath pipe 120 is applied to the negative pressure connecting nozzle mounting assembly 10 and the endoscope 1, and the aforementioned problems can also be solved.

[0060] It should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements not only include those elements, but also include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0061] In addition, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0062] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A sheathed pipe fitting for a negative pressure connection nozzle, characterized in that, The sheath fitting has two through ends and is used to fit around the outer periphery of the negative pressure connector. A first limiting structure is provided inside the sheath fitting to limit the rotation angle of the negative pressure connector inside the sheath fitting. The sheath fitting is also provided with a first positioning structure for cooperating and fixing with the outer shell.

2. The sheathed pipe fitting according to claim 1, characterized in that, The first positioning structure is disposed on the outer surface of the housing and is used to cooperate with and fix the housing in a first direction; And / or, the outer surface of the sheath fitting is further provided with a third positioning structure, which is used to cooperate with the outer shell for fixation in the second direction.

3. The sheathed pipe fitting according to claim 2, characterized in that, The first positioning structure is disposed on the outer surface of the housing and is used to cooperate with the housing in a first direction for fixation. The outer surface of the sheath fitting is also provided with a third positioning structure, which is used to cooperate with the housing in a second direction for fixation. The first direction and the second direction have an included angle.

4. The sheathed pipe fitting according to any one of claims 1-3, characterized in that, The first limiting structure protrudes from the inner surface of the sheath fitting, and the first positioning structure protrudes from the outer surface of the sheath fitting. The first limiting structure and the first positioning structure are disposed opposite to each other on the inner and outer surfaces of the sheath fitting.

5. A negative pressure connector mounting assembly, characterized in that, include: The negative pressure connector and the sheath fitting as described in any one of claims 1-4, wherein one end of the negative pressure connector is rotatably sleeved inside the sheath fitting, and one end of the negative pressure connector is provided with a second limiting structure that cooperates with the first limiting structure.

6. The negative pressure connector mounting assembly according to claim 5, characterized in that, The negative pressure connector also has a fourth limiting structure, which is used to cooperate with the outer shell and restrict the extension and retraction of the negative pressure connector relative to the outer shell.

7. The negative pressure connector mounting assembly according to claim 6, characterized in that, The negative pressure connector mounting assembly further includes: a housing, the housing comprising: a first housing and a second housing that are disposed opposite to each other and detachably connected, the first housing and the second housing being spliced ​​together to form an mounting cavity and a third limiting structure that cooperates with the fourth limiting structure; Both the first housing and the second housing are provided with a second positioning structure that cooperates with the first positioning structure. The first positioning structure is disposed on the outer surface of the sheath fitting and extends in a first direction. The first positioning structure abuts against and is sandwiched between the two second positioning structures. The sheath fitting is disposed in the mounting cavity, and a third positioning structure is also provided on the outer surface of the sheath fitting; The other end of the negative pressure connector extends out of the mounting cavity. The first housing and / or the second housing are provided with a fourth positioning structure that matches the third positioning structure. The third positioning structure and the fourth positioning structure are engaged by pin holes.

8. The negative pressure connector mounting assembly according to claim 7, characterized in that, The first housing has a first structural part and a second structural part inside. The first structural part and the second structural part are intersecting on the splicing surface perpendicular to the first housing and the second housing. The second positioning structure is connected to the first structural part and the second structural part.

9. The negative pressure connector mounting assembly according to claim 7, characterized in that, When the housing is provided with a wire harness extending out of the housing, during the rotation of the negative pressure connector, the distal end of the negative pressure connector moves away from the wire harness extending out of the housing. When the first limiting structure and the second limiting structure limit the negative pressure connector, the proximal end of the negative pressure connector is away from the surface of the first housing and away from the surface of the second housing; or, when the first limiting structure and the second limiting structure limit the negative pressure connector, the proximal end of the negative pressure connector is away from the surface of the second housing and away from the surface of the first housing.

10. An endoscope, characterized in that, Includes the negative pressure connector mounting assembly as described in any one of claims 5-9.

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