CN211324866U - Sheath structure and endoscope - Google Patents

Abstract

The utility model discloses a sheath structure and an endoscope, which are connected with a control part of the endoscope through a joint seat; the insertion portion is then inserted into the constrained channel within the sheath. When the insertion part is inserted into the constraint channel, the bearing part is matched with the inner wall of the sheath tube to limit the insertion part, so that the insertion part is effectively constrained at a specific position in the working process, and the insertion part can stably and accurately acquire an image of a lesion part; meanwhile, the back-and-forth shaking of the insertion part in the sheath pipe is effectively reduced, and stable water return in the water return channel is ensured. In addition, the bearing part adopted by the embodiment is not only favorable for restraining the insertion part, but also ensures the communication state of the restraint channel and the water return channel, so that the water in the body can flow into the water return channel from the restraint channel, the operation space of the water return is effectively enlarged, the blocking probability of the water return channel is reduced, and the water return operation is stable and continuously operated.

Description

Sheath structure and endoscope

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a sheath structure and an endoscope.

Background

The endoscope is used as a medical diagnosis device, and the insertion part integrated with the lens is directly inserted into the body of a patient through a sheath structure in the operation process; then the lens is used for shooting the diseased organ, so that medical staff can directly and quickly know the diseased part, and the success rate of the operation is improved. During the operation, water injection and water return operations are required in the body, and the water return operation is usually completed in a sheath structure.

The inserting part can not be fixed in the traditional endoscope sheath structure, so that the inserting part shakes back and forth in the endoscope sheath structure, and the backwater operation can not be stably carried out in the endoscope sheath structure. For this reason, a fixing structure is added to the sheath structure, and the insertion portion is fixed to the sheath structure by the fixing structure. However, the fixing structure cannot stably limit the insertion part, is complex in structural design and occupies a large amount of space, so that the water return space is reduced, the blockage in the sheath structure is easily caused, and the water return operation of the sheath structure is seriously influenced.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a sheath structure and an endoscope that can stably restrain an insertion portion; meanwhile, the structure is simple, the occupied space is small, and the continuous and stable water return operation of the sheath structure is facilitated.

The technical scheme is as follows:

a sheath structure comprising: the connector base is used for connecting the control part of the endoscope body, and a water outlet is formed in the connector base; with the sheath pipe, the sheath pipe sets up on the joint seat, be equipped with the portion of bearing on the sheath pipe inner wall, just the portion of bearing will restraint passageway and return water passageway that divide into mutual intercommunication in the sheath pipe, the return water passageway with the outlet intercommunication, the restraint passageway is used for inserting the portion of inserting of endoscope body, just the portion of bearing with the cooperation of sheath pipe inner wall is used for injecing the portion of inserting.

The sheath structure is connected with the control part of the endoscope through the joint seat; the insertion portion is then inserted into the constrained channel within the sheath. When the insertion part is inserted into the constraint channel, the bearing part is matched with the inner wall of the sheath tube to limit the insertion part, so that the insertion part is effectively constrained at a specific position in the working process, and the insertion part can stably and accurately acquire an image of a lesion part; meanwhile, the back-and-forth shaking of the insertion part in the sheath pipe is effectively reduced, and stable water return in the water return channel is ensured. In addition, the bearing part of this scheme adoption not only is favorable to retraining the portion of inserting, but also guarantees restraint passageway and return water passageway connected state for in vivo water also can follow during the restraint passageway flows into the return water passageway, has effectively enlarged the operating space of return water, reduces the jam probability of return water passageway, thereby makes return water operation stable, continuous operation. Meanwhile, the sheath structure of the scheme has the advantages of simple structure, small occupied space, convenience in manufacturing, low engineering cost and the like, greatly facilitates the use of medical staff, and is favorable for improving the success rate and stability of the operation.

The principle and effect of the present invention will be further explained by combining the above scheme:

in one embodiment, the number of the bearing parts is two, the two bearing parts are arranged on the inner wall of the sheath pipe at intervals, an opening is reserved between the end parts of the two bearing parts, and the constraint channel is communicated with the water return channel through the opening.

In one embodiment, a first water inlet hole is arranged on the surface of the sheath tube, and the first water inlet hole is communicated with the constraint channel.

In one embodiment, a second water inlet hole is further formed in the surface of the sheath pipe, and the second water inlet hole is communicated with the water return channel.

In one embodiment, the bearing part is a protruding structure, the protruding structure is formed by protruding the inner wall of the sheath, and the protruding structure is arranged along the length direction of the sheath.

In one embodiment, the bearing part comprises a bearing surface for fitting with a side surface of the insertion part.

In one embodiment, the bearing surface is in smooth transition connection with the inner wall of the sheath tube.

In one embodiment, the joint seat is further provided with a jack, the water outlet is communicated with the jack, the sheath tube is inserted into one end of the jack, and the other end of the jack is used for inserting the insertion part and the control part and inserting the insertion part into the constraint channel.

In one embodiment, a sealing ring is arranged in the insertion hole, the sealing ring and the sheath tube are respectively positioned at two opposite sides of the water outlet, and the sealing ring is used for being sleeved on the insertion part in a sealing manner.

In one embodiment, the insertion hole comprises a first insertion section and a second insertion section which are communicated, the sheath is inserted into the first insertion section, the second insertion section is used for inserting the insertion part and the control part, and the inner wall of the second insertion section is used for being attached to the surface of the control part.

In one embodiment, the jack is internally provided with an interference part, the interference part is arranged along the circumferential direction of the jack, and the interference part is used for being in interference fit with the end part of the control part.

An endoscope, including the endoscope body and any one above the endoscope sheath structure, the endoscope body includes a control portion and an insertion portion connected to the control portion, the control portion is connected to the joint base, the insertion portion is inserted into the restraint channel.

The endoscope adopts the sheath structure and is connected with the control part of the endoscope through the joint seat; the insertion portion is then inserted into the constrained channel within the sheath. When the insertion part is inserted into the constraint channel, the bearing part is matched with the inner wall of the sheath tube to limit the insertion part, so that the insertion part is effectively constrained at a specific position in the working process, and the insertion part can stably and accurately acquire an image of a lesion part; meanwhile, the back-and-forth shaking of the insertion part in the sheath pipe is effectively reduced, and stable water return in the water return channel is ensured. In addition, the bearing part of this scheme adoption not only is favorable to retraining the portion of inserting, but also guarantees restraint passageway and return water passageway connected state for in vivo water also can follow during the restraint passageway flows into the return water passageway, has effectively enlarged the operating space of return water, reduces the jam probability of return water passageway, thereby makes return water operation stable, continuous operation. Meanwhile, the sheath structure of the scheme has the advantages of simple structure, small occupied space, convenience in manufacturing, low engineering cost and the like, greatly facilitates the use of medical staff, and is favorable for improving the success rate and stability of the operation.

Drawings

Fig. 1 is a schematic structural view of a sheath according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a sheath according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a sheath according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a joint seat according to an embodiment of the present invention;

fig. 5 is a sectional view of a joint seat according to an embodiment of the present invention;

fig. 6 is a schematic partial structure view of an endoscope according to an embodiment of the present invention;

fig. 7 is a schematic view of a partial structure of an endoscope body according to an embodiment of the present invention.

Description of reference numerals:

100. the endoscope sheath structure comprises an endoscope sheath structure, 110, a connector seat, 111, a jack, 1111, a first insertion section, 1112, a second insertion section, 112, a water outlet, 113, an anti-slip part, 114, a collision part, 120, a sheath pipe, 121, a bearing part, 1211, a bearing surface, 122, a constraint channel, 123, a water return channel, 124, a first water inlet hole, 125, a second water inlet hole, 126, an opening, 130, a connector, 140, a sealing ring, 200, an endoscope body, 210, a control part, 220 and an insertion part.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

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

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present invention, the terms "first" and "second" do not denote any particular quantity or order, but are merely used to distinguish names.

In one embodiment, referring to fig. 1, fig. 2 and fig. 7, a sheath structure 100 includes: the adapter 110 and the sheath tube 120. The joint base 110 is connected to the control section 210 of the endoscope main body 200, and the joint base 110 is provided with a water discharge port 112. The sheath tube 120 is disposed on the joint base 110, a bearing portion 121 is disposed on an inner wall of the sheath tube 120, and the bearing portion 121 divides the interior of the sheath tube 120 into a restricting channel 122 and a water returning channel 123 which are communicated with each other. The water return passage 123 communicates with the drain port 112. The constraining channel 122 is for insertion into the insertion portion 220 of the endoscope body 200, and the bearing portion 121 cooperates with the inner wall of the sheath 120 for defining the insertion portion 220.

The sheath structure 100 described above is connected to the control unit 210 of the endoscope via the joint base 110; the insertion portion 220 is then inserted into the constrained channel 122 within the sheath 120. When the insertion part 220 is inserted into the restriction channel 122, the bearing part 121 and the inner wall of the sheath 120 are matched with each other to define the insertion part 220, so that the insertion part 220 is effectively restricted at a specific position in the working process, and the insertion part 220 can stably and accurately acquire an image of a lesion part; meanwhile, the back-and-forth shaking of the insertion part 220 in the sheath tube 120 is effectively reduced, and stable water return in the water return channel 123 is ensured. In addition, the bearing part 121 adopted in the embodiment is not only beneficial to restricting the insertion part 220, but also ensures the communication state of the restricting passage 122 and the water return passage 123, so that water in the body can flow into the water return passage 123 from the restricting passage 122, the operation space for water return is effectively enlarged, the blocking probability of the water return passage 123 is reduced, and the water return operation is stable and continuous. Meanwhile, the sheath structure 100 of the present embodiment has the advantages of simple structure, small occupied space, convenient manufacturing, low construction cost, etc., and is greatly convenient for medical staff to use, thereby being beneficial to improving the success rate and stability of the operation.

Referring to fig. 7, the control unit 210 and the insertion unit 220 of the present embodiment are two components of an endoscope, and the insertion unit 220 is inserted into the body during the operation; the controller 210 controls the bending of the insertion unit 220 to adjust the imaging angle of the insertion unit 220 in the body, thereby clearly observing the lesion site. The insertion unit 220 is generally integrated with an objective lens, a cover glass, a nozzle, and the like, and the control unit 210 is integrated with a wheel, a wire, and the like. Since the inserting portion 220 and the control portion 210 are not improved in the present embodiment, specific structures of the inserting portion 220 and the control portion 210 will not be described in detail.

It should be further noted that the embodiment of the bearing part 121 cooperating with the inner wall of the sheath 120 for defining the insertion part 220 is as follows: when the insertion part 220 is inserted into the constraint channel 122, the bearing part 121 and the inner wall of the sheath 120 are in limit fit with the surface of the insertion part 220; or, when the inserting portion 220 is inserted into the constraining channel 122, the bearing portion 121 is directly in surface limit fit with the inserting portion 220, a plurality of limit plates are arranged on the inner wall of the sheath tube 120 at intervals along the circumference of the sheath tube 120, and the inner wall of the sheath tube 120 is in surface limit fit with the inserting portion 220 through the limit plates. Of course, providing a plurality of limiting plates on the inner wall of the sheath tube 120 also facilitates to separate the surface of the insertion portion 220 from the inner wall of the sheath tube 120, so that the water in the body can more easily enter the water return channel 123 through the restricting channel 122. Specifically, in the present embodiment, the cross-sectional area of the constraining passage 122 is adapted to the cross-sectional area of the inserting portion 220, that is, when the inserting portion 220 is inserted into the constraining passage 122, the bearing portion 121 and the inner wall of the sheath 120 are both in surface contact with the inserting portion 220.

Optionally, the specific implementation of the bearing portion 121 dividing the interior of the sheath tube 120 into the restriction channel 122 and the water return channel 123 which are communicated with each other may be: one end of the bearing part 121 is arranged on the inner wall of the sheath tube 120, and the other end of the bearing part 121 is arranged at a distance from the inner wall of the sheath tube 120; or, one end of the bearing part 121 is disposed on the inner wall of the sheath tube 120, and the other end of the bearing part 121 is also connected to the inner wall of the sheath tube 120, at this time, a notch is disposed on the bearing part 121, and the restriction channel 122 is communicated with the water return channel 123 through the notch.

Specifically, referring to fig. 1, the bearing portion 121 is disposed on the inner wall of the sheath tube 120 and extends along the length direction of the sheath tube 120, so that the insertion portion 220 is more stably abutted against the bearing portion 121. In order to facilitate understanding of the longitudinal direction of the sheath 120 of the present embodiment, fig. 1 is taken as an example, and the longitudinal direction of the sheath 120 is the direction indicated by S in fig. 1.

Further, referring to fig. 3, there are two carrying portions 121. The two bearing parts 121 are arranged on the inner wall of the sheath tube 120 at intervals, an opening 126 is reserved between the ends of the two bearing parts 121, and the restriction channel 122 is communicated with the water return channel 123 through the opening 126. Therefore, in the present embodiment, the two bearing portions 121 and the inner wall of the sheath 120 form a three-point constraint structure, so that the insertion portion 220 is more stable in the sheath 120, thereby ensuring more stable and safer operation process.

In one embodiment, referring to fig. 3, the supporting portion 121 is a protrusion structure. The convex structure is formed by the inner wall of the sheath tube 120 being convex, and the convex structure is disposed along the length direction of the sheath tube 120. Therefore, the bearing part 121 and the sheath tube 120 are of an integral structure, and the bearing part 121 and the sheath tube 120 are simultaneously molded by adopting an injection molding process, so that the manufacturing time of the sheath structure 100 is greatly shortened, and the production efficiency of the sheath structure 100 is favorably improved. Meanwhile, the bearing part 121 is limited to be the convex structure of the inner wall of the sheath 120 in the embodiment, so that the structure of the bearing part 121 becomes simpler, the largest space is reserved for water return operation, and water can be drained more smoothly through the water return channel 123.

In one embodiment, referring to fig. 2, the sheath 120 has a first water inlet 124 on the surface. The first water inlet hole 124 communicates with the restricted passage 122. First inlet opening 124 is seted up on sheath pipe 120 surface to this embodiment for the water that is located sheath pipe 120 on the surface can follow first inlet opening 124 and get into in proper order restraint passageway 122, the return water passageway 123, so, makes the water inlet direction of sheath pipe 120 increase, guarantees that the water homoenergetic of all directions is stable, get into sheath pipe 120 smoothly, and then effectively is discharged.

In one embodiment, referring to fig. 2, a second water inlet 125 is further disposed on the surface of the sheath tube 120. The second water inlet 125 is communicated with the water return passage 123. Similarly, the second water inlet 125 is formed in the surface of the sheath tube 120, so that water on the surface of the sheath tube 120 can directly enter the water return channel 123 from the second water inlet 125, and thus, the stable and smooth entry of water in all directions into the sheath tube 120 is further ensured.

In one embodiment, referring to fig. 3, the supporting portion 121 includes a supporting surface 1211. The bearing surface 1211 is adapted to fit with a side surface of the insertion portion 220. Therefore, the combination of the insertion portion 220 and the bearing portion 121 is more stable through the bearing surface 1211, and the distortion of the picture acquired by the insertion portion 220 due to the shaking of the insertion portion 220 on the bearing portion 121 is avoided, which is beneficial to ensuring more stable performance of the endoscope. Specifically, in the present embodiment, the bearing surface 1211 is an arc surface, and the arc of the arc surface matches with the arc of the surface of the insertion portion 220.

Further, referring to fig. 3, the bearing surface 1211 is in smooth transition connection with the inner wall of the sheath 120, so as to ensure that the bearing portion 121 is more smoothly connected with the inner wall of the sheath 120, and prevent the interface between the bearing portion 121 and the inner wall of the sheath 120 from having a plane height difference, which may cause the insertion portion 220 not to be simultaneously attached to the bearing surface 1211 and the inner wall of the sheath 120, so that the insertion portion 220 is more stable in the sheath 120.

In one embodiment, referring to fig. 1, an end surface of the sheath 120 away from the connector base 110 is an inclined surface, which is beneficial to enlarge the opening 126 degree of one end of the sheath 120, so that the insertion portion 220 can photograph a larger range, and the medical staff can observe the lesion more clearly. Specifically in the present embodiment, one end of the inclined surface is inclined toward the water return passage 123, and the other end of the inclined surface is inclined away from the restricting passage 122. The specific structure is shown in fig. 1.

In one embodiment, referring to fig. 2 and 7, the socket 110 further has a receptacle 111. The drain port 112 communicates with the insertion hole 111. The sheath 120 is inserted into one end of the insertion hole 111, and the other end of the insertion hole 111 is used for inserting the control portion 210 and the insertion portion 220, and inserting the insertion portion 220 into the constrained channel 122. It can be seen that, when the sheath tube 120 is inserted into the insertion hole 111, not only the sheath tube 120 is connected to the joint base 110, but also the sheath tube 120 is communicated with the insertion hole 111, that is, the restriction channel 122 and the water return channel 123 are both communicated with the insertion hole 111. As such, during the operation, the insertion portion 220 is inserted into the insertion hole 111, and the insertion portion 220 is extended into the constraining passage 122, so that the insertion portion 220 is fixed inside the sheath tube 120; after the fixation is completed, the insertion part 220 is inserted into the body through the sheath tube 120, and at this time, water in the body flows into the insertion hole 111 through the water return passage 123; and then flows into the drain port 112 through the insertion hole 111, thereby completing the operation of discharging the body water.

Further, referring to fig. 4 and 5, a sealing ring 140 is disposed in the insertion hole 111. The sealing rings 140 and the sheath tube 120 are respectively located at opposite sides of the drain opening 112, and the sealing rings 140 are adapted to be sealed and fitted on the insertion portion 220. As can be seen, when the sheath tube 120 is inserted into the body and brought into contact with water in the body, the insertion portion 220 is sealingly engaged with the socket 110 by the packing 140, and the inside of the sheath tube 120 is in a vacuum state. When negative pressure is applied to the water outlet 112, the water in the body stably flows back to the water outlet 112 along the water return channel 123, so that the water in the body is discharged more stably and smoothly. Meanwhile, as the sealing ring 140 is hermetically sealed and arranged on the insertion portion 220, when the insertion portion 220 is pulled out, the sealing ring 140 is still hermetically sealed and arranged on the insertion portion 220, so that the insertion portion 220 and the connector base 110 are always in sealing fit, the sheath tube 120 is always in a vacuum state, the phenomenon that water in a body cannot flow back due to the pulling of the insertion portion 220 is avoided, and the use stability of the sheath structure 100 is greatly improved.

It should be noted that, in the sealing sleeve of the present embodiment, the sealing ring 140 is sleeved on the insertion portion 220, and the sealing ring 140 is tightly attached to the insertion portion 220, so as to ensure the sealing property between the sealing ring 140 and the insertion portion 220. Specifically, in the present embodiment, the sealing ring 140 is interference fit or over-fit with the insertion portion 220. The sealing ring 140 is a nitrile rubber sealing ring, a hydrogenated nitrile rubber sealing ring, a silicone rubber sealing ring, a fluorine rubber sealing ring or other sealing rings.

It should be noted that when one end of the sheath tube 120 is inserted into the insertion hole 111, one end of the sheath tube 120 may be tightly attached to the hole wall of the insertion hole 111 by an interference fit method, an over-fit method, or an adhesion method.

Alternatively, the sealing ring 140 may be bonded, snapped, injection molded, or otherwise disposed within the receptacle 111. Wherein, when sealing washer 140 sets up in jack 111 through the mode of moulding plastics, set up gluey groove in advance in jack 111, at the secondary in-process of moulding plastics, pour into the material into to glue the inslot, thereby form sealing washer 140, like this, be favorable to improving the cohesion between the pore wall of sealing washer 140 and jack 111.

In one embodiment, referring to fig. 5, the socket 111 includes a first insertion section 1111 and a second insertion section 1112 that are in communication. The sheath 120 is inserted into the first insertion section 1111. The second insertion segment 1112 is used for inserting the control portion 210 and the insertion portion 220, and an inner wall of the second insertion segment 1112 is used for being arranged in surface fit with the control portion 210. Therefore, the insertion hole 111 of the present embodiment is divided into two parts, one part is used for connecting the sheath tube 120, and the other part is used for inserting the control part 210 and the insertion part 220, which is beneficial to facilitating the assembly operation of the endoscope. Meanwhile, the inner wall of the second insertion section 1112 is attached to the surface of the control portion 210, so that the joint base 110 is tightly combined with the control portion 210, the sealing effect between the joint base 110 and the control portion 210 is improved, and a good vacuum degree is maintained in the sheath tube 120. In the present embodiment, the inner wall of the second insertion section 1112 is conical.

In one embodiment, referring to fig. 5, an interference portion 114 is further disposed in the insertion hole 111. The interference part 114 is circumferentially disposed along the insertion hole 111, and the interference part 114 is for interference-fitting with an end of the control part 210. Therefore, the interference part 114 limits the insertion depth of the control part 210 on the adapter 110, and avoids the control part 210 from being inserted too much to cause the easy damage of the sheath structure 100.

In one embodiment, referring to fig. 4, the surface of the connector base 110 is provided with a non-slip portion 113, so that the medical staff can stably hold and use the connector base 113. The anti-slip portion 113 may have a groove structure or a strip structure.

In one embodiment, referring to fig. 2, the connector base 110 is further provided with a connector 130, and the connector 130 is communicated with the water outlet 112, so that the water in the body can be conveniently discharged. Wherein, the connector 130 is used for connecting with external negative pressure equipment. Specifically, in the present embodiment, the connector 130 is a luer connector.

In one embodiment, referring to fig. 1, fig. 2, fig. 6 and fig. 7, an endoscope includes an endoscope body 200 and a sheath structure 100 in any one of the above embodiments. The endoscope main body 200 includes a control section 210 and an insertion section 220 connected to the control section 210. The control portion 210 is connected to the socket 110. The insertion portion 220 is inserted into the constrained channel 122.

The endoscope described above is configured to employ the sheath structure 100 described above, and is connected to the control unit 210 of the endoscope via the joint 110; the insertion portion 220 is then inserted into the constrained channel 122 within the sheath 120. When the insertion part 220 is inserted into the restriction channel 122, the bearing part 121 and the inner wall of the sheath 120 are matched with each other to define the insertion part 220, so that the insertion part 220 is effectively restricted at a specific position in the working process, and the insertion part 220 can stably and accurately acquire an image of a lesion part; meanwhile, the back-and-forth shaking of the insertion part 220 in the sheath tube 120 is effectively reduced, and stable water return in the water return channel 123 is ensured. In addition, the bearing part 121 adopted in the embodiment is not only beneficial to restricting the insertion part 220, but also ensures the communication state of the restricting passage 122 and the water return passage 123, so that water in the body can flow into the water return passage 123 from the restricting passage 122, the operation space for water return is effectively enlarged, the blocking probability of the water return passage 123 is reduced, and the water return operation is stable and continuous. Meanwhile, the sheath structure 100 of the present embodiment has the advantages of simple structure, small occupied space, convenient manufacturing, low construction cost, etc., and is greatly convenient for medical staff to use, thereby being beneficial to improving the success rate and stability of the operation.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A sheath structure, comprising:

the connector base is used for connecting the control part of the endoscope body, and a water outlet is formed in the connector base; and

the sheath pipe, the sheath pipe sets up on the joint seat, be equipped with the portion of bearing on the sheath pipe inner wall, just the portion of bearing will restraint passageway and return water passageway that divide into mutual intercommunication in the sheath pipe, the return water passageway with the outlet intercommunication, the restraint passageway is used for inserting the portion of inserting of endoscope body, just the portion of bearing with the cooperation of sheath pipe inner wall is used for injecing the portion of inserting.

2. The sheath structure of claim 1, wherein the number of the bearing portions is two, the two bearing portions are arranged on the inner wall of the sheath tube at intervals, an opening is reserved between the end portions of the two bearing portions, and the restriction channel is communicated with the water return channel through the opening.

3. A sheath structure according to claim 2, wherein a first water inlet hole is provided on the sheath surface, the first water inlet hole communicating with the constraining passage; or,

and a second water inlet hole is also formed in the surface of the sheath pipe and communicated with the water return channel.

4. The mirror sheath structure according to claim 2, wherein the bearing portion is a projection structure formed by projecting the inner wall of the sheath tube, and the projection structure is provided along a length direction of the sheath tube.

5. The mirror sheath structure according to claim 1, wherein the bearing portion includes a bearing surface for fitting with a side of the insertion portion.

6. The sheath structure of claim 5, wherein the bearing surface is in smooth transition with the inner wall of the sheath.

7. The sheath structure according to any one of claims 1 to 6, wherein a socket is further provided on the joint base, the drain port communicates with the socket, the sheath tube is inserted into one end of the socket, and the other end of the socket is used for inserting the insertion portion and the control portion and inserting the insertion portion into the restraint passage.

8. A sheath structure according to claim 7, wherein a sealing ring is provided in the insertion hole, the sealing ring and the sheath tube are respectively provided at opposite sides of the drainage port, and the sealing ring is provided to be sealingly fitted on the insertion portion.

9. The sheath structure of claim 7, wherein the insertion hole comprises a first insertion section and a second insertion section which are communicated, the sheath is inserted into the first insertion section, the second insertion section is used for inserting the insertion part and the control part, and the inner wall of the second insertion section is used for being attached to the surface of the control part; or,

still be equipped with conflict portion in the jack, conflict portion along jack circumference sets up, just conflict portion be used for with the tip conflict cooperation of control portion.

10. An endoscope comprising an endoscope body and the sheath structure according to any one of claims 1 to 9, wherein the endoscope body comprises a control portion and an insertion portion connected to the control portion, the control portion is connected to the joint base, and the insertion portion is inserted into the constrained channel.

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