Protective sheath and endoscope assembly

Abstract

The present application relates to the field of medical devices. Disclosed are a protective sheath and an endoscope assembly. The protective sheath comprises a sheath tube handle and a sheath tube. The axis of an insertion port is offset relative to the axis of the sheath tube. Under the constraint or limiting action of the insertion port, an insertion portion inserted into the sheath tube is offset relative to the sheath tube, that is, the axis of the insertion portion is located to one side of the axis of the sheath tube, such that a larger space is formed on the side of the insertion portion close to the axis of the sheath tube, such that a medium can be aspirated at a higher flow rate. In this arrangement, a gap with a larger space can be formed between the sheath tube and the insertion portion, thereby improving the aspiration efficiency of the gap and ensuring that a larger volume of the aspirated material can be introduced into the gap.

Description

A protective sheath and endoscope assembly Technical Field

[0001] This application relates to the field of medical devices, and more particularly to a protective sheath and endoscope assembly. Background Technology

[0002] Protective sheaths and endoscopes are high-precision medical devices specifically designed and widely used in the examination and treatment of the urinary system. As an auxiliary tool, the protective sheath is typically used to guide endoscopes or other medical instruments into the urinary system, ensuring the accuracy and safety of the procedure. Its design fully considers the physiological structure of the human urinary system, effectively reducing trauma and complications during surgery, and improving the success rate of the procedure and the speed of patient recovery.

[0003] The insertion part is inserted into the sheath. However, in practice, it has been found that the position of the insertion part inside the protective sheath is uncertain, resulting in poor suction and an inability to pass through large volumes of suctioned material. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned related technologies, this application provides a protective sheath and endoscope assembly to solve the above-mentioned technical problems.

[0005] This application provides a protective sheath for an endoscope. The endoscope includes an insertion part, and the protective sheath includes a sheath handle and a sheath tube. The sheath handle has an insertion interface that can pass through the insertion part. The proximal end of the sheath tube is connected to the sheath handle, and the sheath tube and the insertion interface are in communication with each other. The axis of the insertion interface is offset relative to the axis of the sheath tube.

[0006] To achieve the above and other related objectives, this application provides an endoscope assembly, which includes a protective sheath and an endoscope as described above. The endoscope includes an insertion portion that can be inserted into the sheath via an insertion interface.

[0007] The technical solution adopted in this application achieves the following beneficial effects: The protective sheath has a sheath handle and a sheath tube, with the insertion interface between the sheath tube and the sheath handle connected. The insertion part of the endoscope can pass through the insertion interface, the axis of which is offset relative to the axis of the sheath tube. Under the constraint or limiting effect of the insertion interface, the insertion part inserted into the sheath tube is offset relative to the sheath tube, that is, the axis of the insertion part is located on one side of the axis of the sheath tube. The side of the insertion part closer to the axis of the sheath tube forms a larger space, allowing for faster flow of the medium. This arrangement allows for a larger gap between the sheath tube and the insertion part, improving the suction efficiency of the gap and ensuring that larger volumes of aspirable material can be inserted into the gap. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 is a schematic diagram of the structure of a protective sheath shown in an exemplary embodiment of this application;

[0010] Figure 2 is a schematic diagram of the structure of an endoscope shown in an exemplary embodiment of this application;

[0011] Figure 3 is a cross-sectional view of another protective sheath shown in an exemplary embodiment of this application;

[0012] Figure 4 is a cross-sectional view of a multi-port connector and insertion portion illustrating an exemplary embodiment of this application;

[0013] Figure 5 is a cross-sectional view of a sheath shown in an exemplary embodiment of this application;

[0014] Figure 6 is a cross-sectional view of a sheath and a multi-port connector shown in an exemplary embodiment of this application;

[0015] Figure 7 is a schematic diagram of the sheath structure from another perspective, illustrating an exemplary embodiment of this application;

[0016] Figure 8 is a schematic diagram of the structure of the limiting member shown in an exemplary embodiment of this application;

[0017] Figure 9 is a cross-sectional view of a limiting member illustrating an exemplary embodiment of this application;

[0018] Figure 10 is a schematic diagram of the limiting member from another perspective, illustrating an exemplary embodiment of this application;

[0019] Figure 11 is a schematic diagram of the structure of an endoscope assembly shown in an exemplary embodiment of this application.

[0020] In the diagram: 1. Protective sheath; 110. Sheath tube; 111. Inner tube; 1111. Insertion channel; 112. Outer tube; 1121. Second step; 113. Limiting element; 114. Limiting body; 115. First mounting part; 116. Second mounting part; 117. First step; 118. Groove; 119. Notch; 120. Sheath tube handle; 121. Mounting cavity; 122. Multi-port connector; 123. Main channel; 124. Branch channel; 125. Instrument channel; 126. Suction channel; 130. Insertion interface; 140. Suction valve; 150. Instrument connector; 160. Through hole; 2. Endoscope; 210. Insertion part; 220. Operating part; 3. Endoscope assembly. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".

[0024] Because of poor suction, the position of the endoscope insertion part within the protective sheath is uncertain. Within the sheath, the insertion part may exhibit bending, spiraling, or other irregularities, resulting in the absence of a complete channel between the sheath and the insertion part. This leads to significant resistance to the aspirated material within the sheath, severely hindering its transport.

[0025] This application provides a protective sheath 1, as shown in Figure 1. The protective sheath 1 is used for an endoscope 2. As shown in Figure 2, the endoscope 2 may include an insertion part 210, which can be inserted into the protective sheath 1. The protective sheath 1 can protect and guide the endoscope 2.

[0026] Please refer back to Figure 1. The protective sheath 1 may include a sheath handle 120 and a sheath 110, with the proximal end of the insertion tube connected to the sheath handle 120. The sheath handle 120 optimizes the grip of medical personnel, preventing the sheath 110 from slipping out of their hands. In one embodiment, the endoscope 2 may also include an operating section 220, which can be housed within the sheath handle 120. This arrangement increases the overlap area between the operating section 220 and the sheath handle 120, shortens the distance between their centers of gravity, and improves the operator's feel.

[0027] Referring to Figures 3 and 4, the sheath handle 120 has an insertion port 130. The insertion port 130 may be approximately the same size and shape as the insertion portion 210, such as having the same inner diameter as the outer diameter of the insertion port 130. The insertion port 130 allows passage through the insertion portion 210, which in turn constrains the insertion portion 210. The sheath 110 communicates with the insertion port 130, and the axis of the insertion port 130 is offset relative to the axis of the sheath 110. Under the constraint or limiting effect of the insertion port 130, the insertion portion 210 inserted into the sheath 110 is offset relative to the sheath 110; that is, the axis of the insertion portion 210 is located to one side of the axis of the sheath 110. The side of the insertion portion 210 closer to the axis of the sheath 110 forms a larger space, allowing for faster flow of the medium. This arrangement allows for a larger gap between the sheath 110 and the insertion part 210, improving the suction efficiency of the channel and ensuring that larger suction objects can be inserted into the gap.

[0028] In one embodiment, referring to Figures 3 and 4, a multi-port connector 122 is provided within the sheath handle 120. The multi-port connector 122 includes a main channel 123 and a branch channel 124 that are interconnected. The main channel 123 has a first end and a second end that are spaced apart from each other. The first end communicates with the sheath 110, and the second end is used to insert the insertion part 210. The main channel 123 ensures that the insertion part 210 can be inserted into the sheath 110, and provides a straighter channel for the insertion part 210, allowing it to be inserted into the sheath 110 more easily. An insertion port 130 is provided on the main channel 123, located between the first and second ends. The insertion port 130 restricts the insertion part 210 within the main channel 123, preventing it from shifting or bending. This allows a straighter gap to be formed between the sheath 110 and the insertion part 210, improving the suction efficiency of the gap.

[0029] Referring to Figure 3, branch 124 connects the first end of the main channel 123 to the connector 130. Branch 124 can connect to other devices, such as aspiration valve 140, instrument connector 150, etc. Aspiration valve 140 provides a negative pressure environment for the aspirated material, allowing it to flow through sheath 110 to branch 124 of multi-port connector 122. The connection of aspiration valve 140 enables timely and effective removal of blood, body fluids, or other waste generated during surgery, maintaining a clear surgical field and reducing the risk of complications. Instrument connector 150 can be used to insert biopsy forceps, lasers, and other treatment instruments for subsequent procedures.

[0030] For example, referring to Figure 4, branch 124 may include a suction channel 126 and an instrument channel 125. The suction channel 126 and the instrument channel 125 are interconnected and connected to the main channel 123. Referring to Figure 3, the sheath handle 120 is also provided with a suction valve 140 and an instrument connector 150. The suction channel 126 can be connected to the suction valve 140, and the instrument channel 125 can be connected to the instrument connector 150. This arrangement allows the sheath 110 to be simultaneously connected to both the suction channel 126 and the instrument channel 125. While the treatment instrument can be inserted into the gap between the insertion part 210 and the sheath 110, the suction valve 140 is connected to a negative pressure pump to perform a suction operation on the gap between the insertion part 210 and the sheath 110, enriching the functionality of the protective sheath 1 so that the protective sheath 1 can handle multiple different operations in parallel.

[0031] Preferably, the insertion port 130 is offset relative to the main channel 123. The sheath handle 120 includes a first side and a second side that are far apart from each other. The axis of the insertion port 130 (as shown by L2 in Figure 4) is located on the first side of the axis of the main channel 123 (as shown by L1 in Figure 4). This arrangement allows the insertion portion 210 of the insertion sheath 110 to be offset relative to the sheath 110, so that the side of the insertion portion 210 closer to the second side forms a larger space. The larger space is conducive to inserting a larger treatment instrument and improving the suction effect of the insertion tube. At the same time, the branch 124 is located on the second side of the main channel 123. Furthermore, the suction channel 126 and the instrument channel 125 are located on the second side of the main channel 123. The suction channel 126 and the instrument channel 125 can connect to the side with the larger space, effectively ensuring that the treatment instrument can be inserted into this larger space and improving the suction effect of the insertion tube.

[0032] In another case, the multi-port connector 122 can be integrated with the sheath handle 120 to improve the structural stability of the multi-port connector 122 and improve the assembly efficiency of the protective sheath 1, which will not be elaborated here.

[0033] In another embodiment, the sheath handle 120 has a housing, an insertion port 130 is formed in the housing, and the proximal end of the sheath 110 is connected to the housing. Exemplarily, the housing has a first end connected to the sheath 110. The first end has a mounting hole, the insertion port 130 is located within the mounting hole, and the axis of the insertion port is offset from the axis of the mounting hole. The insertion port 130 may consist of a limiting structure formed on the inner wall of the mounting hole, such as an elastic element, a step, a protrusion, or a combination thereof; this embodiment is not limited to this. The insertion port 130 is relatively offset from the sheath 110, allowing the insertion part 210 to be inserted into the sheath 110 through the housing, but it is also constrained by the insertion port 130, causing the insertion part 210 to be offset relative to the sheath 110. This creates a larger space on one side of the insertion part 210, which facilitates the insertion of larger treatment instruments and improves the suction effect of the insertion tube.

[0034] Furthermore, the sheath handle 120 still contains a multi-port connector 122, the distal end of the main channel 123 of the multi-port connector 122 being connected to the insertion port 130. The insertion portion 210 can pass through the multi-port connector 122 and through the insertion port 130 until it reaches the sheath 110. The insertion port 130 can cause the insertion portion 210 to be offset relative to the multi-port connector 122, and the branch 124 of the multi-port connector 122 can still be configured on the side of the insertion portion 210 that forms a larger space, effectively ensuring that the treatment instrument can be inserted into this larger space and improving the suction effect of the insertion tube.

[0035] In this embodiment, referring to Figure 5, the sheath 110 has an inner tube 111 and an outer tube 112. The inner tube 111 and the outer tube 112 are independently arranged, and the diameter ratio between the inner tube 111 and the outer tube 112 can be 1:2, 1:3, or 1:4, etc., and this embodiment is not limited thereto. The outer tube 112 is connected to the sheath handle 120. Exemplarily, the sheath handle 120 includes a multi-port connector 122, and the outer tube 112 can communicate with the multi-port connector 122.

[0036] Referring to Figure 6, the inner tube 111 is located inside the outer tube 112 and communicates with the insertion port 130, so that the inner tube 111 is offset relative to the outer tube 112. Exemplarily, the sheath handle 120 includes a multi-port connector 122, and the inner tube 111 can communicate with the insertion port 130 of the multi-port connector 122. The inner tube 111 enables the insertion portion 210 to be offset relative to the outer tube 112. Exemplarily, under the limiting action of the multi-port connector 122, the axis of the inner tube 111 (as shown by L2 in Figure 6) is located on the first side of the axis of the outer tube 112 (as shown by L1 in Figure 6), to achieve a larger space on one side. In addition, the branch 124 is located on the side of the inner tube 111 with the larger space. Simultaneously, the inner tube 111 provides an independent insertion channel 1111 for the insertion portion 210 of the endoscope 2, avoiding entanglement between the insertion portion 210 and the treatment instrument, improving the independence and safety of the insertion portion 210.

[0037] In another configuration, the insertion port 130 is formed in the housing of the sheath handle 120, and the inner tube 111 is connected to the insertion port 130. The outer tube 112 connects to the mounting hole in the housing of the sheath handle 120, and the insertion port 130 is offset relative to the mounting hole, located within the mounting hole. For example, the inner wall forming the mounting hole is provided with a limiting structure, such as an elastic element, which can be a thin stainless steel sheet. The proximal end of the inner tube 111 can connect to the elastic element, which restricts the proximal end of the inner tube 111 to achieve a larger space on one side; further details are omitted here.

[0038] Please refer to Figure 7. The distal end of the inner tube 111 is sealed, and the sheath handle 120 has a mounting cavity 121 for inserting the operating part 220 of the endoscope 2. The proximal end of the inner tube 111 communicates with the mounting cavity 121. In other words, the insertion channel 1111 is sealed, and the insertion part 210 located within the insertion channel 1111 will not directly contact the external environment. For example, the insertion part 210 does not directly or indirectly contact human body cavities. The insertion channel 1111 can prevent the insertion part 210 from being contaminated, and the disinfection requirements of the insertion part 210 will be reduced, thus reducing usage costs. In addition, the mounting cavity 121 of the sheath handle 120 can integrate the sheath handle 120 and the operating part 220 of the endoscope 2 into one unit, improving the operating feel and reducing the operating range of medical staff's hands. At the same time, it can also prevent medical staff from directly contacting the operating part 220 during surgery, and the endoscope 2 can be reused.

[0039] Please refer to Figure 7. A limiting member 113 may also be provided at the distal end of the sheath 110. The limiting member 113 can be made of a transparent material, such as resin, glass, or a combination of various materials; this embodiment is not limited to this. The limiting member 113 connects the outer tube 112 and the inner tube 111. The limiting member 113 can seal the distal end of the inner tube 111 and offset the inner tube 111 from the outer tube 112. The limiting member 113 can also close the distal end of the inner tube 111 to prevent contamination of the insertion part 210. The limiting member 113 can act on the distal end of the sheath 110 to offset the distal end of the inner tube 111 relative to the outer tube 112. The limiting member 113 and the insertion interface 130 cooperate with each other, one limiting the distal end of the inner tube 111 and the other limiting the proximal end of the inner tube 111. In addition, the dimensional relationship between the inner tube 111 and the outer tube 112 causes the inner tube 111 to be offset relative to the outer tube 112 at all points, so as to form an independent and straight gap between the inner tube 111 and the outer tube 112, which significantly improves the insertion effect of the treatment instrument.

[0040] In one embodiment, referring to Figures 8 and 9, the limiting member 113 may include a limiting body 114, a first mounting portion 115, and a second mounting portion 116. The first mounting portion 115 and the second mounting portion 116 may be an annular structure, etc., and this embodiment is not limited thereto. The first mounting portion 115 and the second mounting portion 116 are disposed on the surface of the limiting body 114. Further, the first mounting portion 115 and the second mounting portion 116 may protrude from the same surface of the limiting body 114. The first mounting portion 115 connects to the outer tube 112, and the second mounting portion 116 connects to the inner tube 111. The connection method may be welding, bonding, snap-fit ​​connection, etc., and this embodiment is not limited thereto. For example, the second mounting portion 116 is located inside the first mounting portion 115, and the second mounting portion 116 and the first mounting portion 115 are off-axis. This arrangement allows the outer tube 112 and the inner tube 111 to be relatively offset, and a larger space is formed on the side of the insertion portion 210 of the inner tube 111 relative to the outer tube 112.

[0041] Please refer to Figure 10. The limiting body 114 is provided with a through hole 160, which connects to the outer tube 112. This arrangement allows passage from the distal end to the proximal end of the outer tube 112, enabling the surgical instruments to extend through the through hole 160 to the distal end of the outer tube 112 for subsequent operations. The negative pressure pump can also aspirate substances from the distal end of the outer tube 112, thus effectively and promptly removing blood, body fluids, or other waste generated during the procedure, maintaining a clear surgical field, and reducing the risk of complications. Furthermore, the limiting body 114 can seal the distal end of the inner tube 111, achieving a sealing arrangement at the distal end of the inner tube 111. This prevents the insertion part 210 from directly or indirectly contacting human body cavities, thereby reducing the sterilization requirements of the insertion part 210 and lowering usage costs.

[0042] In this embodiment, referring to Figure 8, a first step 117 is disposed between the first mounting portion 115 and the limiting body 114. The first step 117 is located on the outer surface of the limiting member 113, and the outer diameter of the first mounting portion 115 is smaller than that of the limiting body 114. This arrangement allows the first step 117 to face the side of the first mounting portion 115 closest to the outer tube 112, and the first step 117 abuts against the distal end face of the outer tube 112 to achieve a limiting function. In addition, the outer tube 112 is provided with a second step 1121, which is located on the inner wall of the outer tube 112 and abuts against the end of the first mounting portion 115 furthest from the limiting body 114. This arrangement allows the second step 1121 to face the side of the outer tube 112 closest to the first mounting portion 115, and the second step 1121 abuts against the distal end face of the first mounting portion 115 to achieve a limiting function.

[0043] At the same time, the outer wall of the first mounting part 115 can contact at least part of the inner wall of the outer tube 112. This arrangement can increase the contact area between the outer tube 112 and the limiting member 113, thereby improving the installation effect.

[0044] In one embodiment, the first step 117 can be configured as a protrusion, and the distal end face of the outer tube 112 is provided with a groove 118, with the protrusion and groove 118 correspondingly arranged. When the protrusion is embedded in the groove 118, the distal end face of the outer tube 112 abuts against the first step 117, and the offset direction of the distal end of the inner tube 111 is in the same direction as the offset direction of the proximal end of the inner tube 111. This same direction means that, relative to the outer tube 112, the offset directions of the two ends of the inner tube 111 are consistent, that is, the protective sheath 1 includes a first side and a second side that are far apart from each other, and the axis of the insertion interface 130 is located on the first side of the axis of the outer tube 112, so that the axis of the proximal end of the inner tube 111 is located on the first side of the axis of the outer tube 112. Under the action of the limiting member 113, the axis of the distal end of the inner tube 111 is located on the first side of the axis of the outer tube 112.

[0045] Please refer to Figures 9 and 10. The limiting body 114 has a groove 118, which surrounds the outer periphery of the second mounting part 116. The inner tube 111 is inserted into the groove 118. The end of the inner tube 111 can be inserted into the groove 118, and the end face of the end can abut against the bottom of the groove 118, thus providing a limiting function. In addition, the groove wall of the groove 118 can contact the inner and outer walls of the inner tube 111, which increases the contact area between the inner tube 111 and the limiting member 113, improving the installation effect.

[0046] Understandably, when the sheath 110 rotates to a certain angle, the deformation of the inner tube 111 and the outer tube 112 is different; that is, the bending deformation of the outer tube 112 is greater, while the bending deformation of the inner tube 111 is smaller. The end of the inner tube 111 may extend beyond the end of the outer tube 112. Therefore, the groove wall of the groove 118 of the limiting body 114 can connect to the inner tube 111, thereby limiting the inner tube 111 by the limiting member 113. A gap is provided between the bottom of the groove 118 and the end of the inner tube 111. This gap is suitable for the extension and retraction of the inner tube 111 relative to the outer tube 112, and this gap can prevent excessive deformation or compression of the inner tube 111.

[0047] Preferably, referring again to Figure 8, a notch 119 is provided at the end of the first mounting portion 115 away from the limiting body 114. The notch 119 provides deformation space for the first mounting portion 115. For example, the first mounting portion 115 can be interference-fitted with the outer tube 112. When the first mounting portion 115 is inserted into the outer tube 112, the first mounting portion 115 deforms, the notch 119 contracts, and the outer diameter of the first mounting portion 115 decreases, allowing the first mounting portion 115 to be inserted into the outer tube 112. Furthermore, the first mounting portion 115 returns to its original shape, generating elasticity. This elasticity continuously compresses the inner wall of the outer tube 112, generating friction between the first mounting portion 115 and the outer tube 112. This friction restricts the separation of the first mounting portion 115 and the outer tube 112, thereby improving the connection stability between the limiting member 113 and the sheath 110.

[0048] To achieve the above and other related objectives, this application provides an endoscope assembly 3. Referring to Figure 11, the endoscope assembly 3 includes a protective sheath 1 and an endoscope 2 as described above. This gives the endoscope assembly 3 the beneficial effects of any of the aforementioned solutions, which will not be elaborated further here. In one embodiment, the endoscope 2 may include an insertion portion 210, which can be inserted into the sheath tube 110 through the insertion interface 130 of the protective sheath 1.

[0049] The endoscope 2 can be a bronchoscope, pyeloscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. The embodiments of this application do not specifically limit the type of endoscope 2.

[0050] The technical solution adopted in this application achieves the following beneficial effects: The protective sheath 1 has a sheath handle 120 and a sheath 110, with the sheath 110 communicating with the insertion interface 130 of the sheath handle 120. The insertion part 210 of the endoscope 2 can pass through the insertion interface 130, and the axis of the insertion interface 130 is offset relative to the axis of the sheath 110. Under the constraint or limiting effect of the insertion interface 130, the insertion part 210 inserted into the sheath 110 is offset relative to the sheath 110, that is, the axis of the insertion part 210 is located on one side of the axis of the sheath 110, and the side of the insertion part 210 closer to the axis of the sheath 110 forms a larger space, allowing for faster flow of the medium. This arrangement allows for a larger gap between the sheath 110 and the insertion part 210, improving the suction efficiency of the gap and ensuring that larger volumes of aspirated material can be inserted into the gap.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A protective sheath for an endoscope comprising an insertion portion, characterized in that, The protective sheath comprises: a sheath handle having a plug-in interface capable of being plugged into the insertion part; a sheath tube, a proximal end of which is connected to the sheath handle, the sheath tube and the plug-in interface being in communication with each other, and an axis of the plug-in interface being offset relative to an axis of the sheath tube.

2. The protective sheath of claim 1, wherein, A multi-way joint is arranged in the sheath handle, the multi-way joint comprising a main channel and a branch channel in communication with each other, the main channel having a first end and a second end away from each other, the first end being in communication with the sheath tube, the second end being used for plugging into the insertion part, the plug-in interface being arranged on the main channel and located between the first end and the second end, the branch channel being connected between the first end of the main channel and the plug-in interface; Alternatively, the sheath handle has a housing, the plug-in interface being arranged in the housing, and the proximal end of the sheath tube being connected to the housing.

3. The protective sheath of claim 2, wherein, The plug-in interface is offset relative to the main channel, the sheath handle comprising a first side and a second side away from each other, an axis of the plug-in interface being located on the first side of the axis of the main channel, and the branch channel being located on the second side of the main channel.

4. The protective sheath of any one of claims 1-3, wherein, The sheath tube has an inner tube and an outer tube, the outer tube being connected to the sheath handle, and the inner tube being located in the outer tube and in communication with the plug-in interface, so that the inner tube is offset relative to the outer tube.

5. The protective sheath of claim 4, wherein, A distal end of the inner tube is sealingly arranged, the sheath handle has a mounting cavity for inserting an operation part of the endoscope, and a proximal end of the inner tube is in communication with the mounting cavity.

6. The protective sheath of claim 4, wherein, A limiting member is further arranged at a distal end of the sheath tube, the limiting member connecting the outer tube and the inner tube, the limiting member being capable of sealing the distal end of the inner tube and offsetting the inner tube relative to the outer tube.

7. The protective sheath of claim 6, wherein, The limiting member comprises a limiting body, a first mounting part and a second mounting part, the first mounting part and the second mounting part being arranged on a surface of the limiting body, the first mounting part connecting the outer tube, the second mounting part connecting the inner tube, the limiting body sealing the distal end of the inner tube, and the limiting body being provided with a through hole in communication with the outer tube.

8. The protective sheath of claim 7, wherein, A first step is arranged between the first mounting part and the limiting body, the first step being located on an outer surface of the limiting member, and an outer diameter of the first mounting part being smaller than that of the limiting body, the first step being in abutment with a distal end face of the outer tube; and / or, the outer tube is provided with a second step, the second step being located on an inner wall of the outer tube, and the second step being in abutment with an end of the first mounting part away from the limiting body.

9. The protective sheath of claim 7, wherein, The limiting body is provided with a groove, the groove being arranged around an outer periphery of the second mounting part, and the inner tube being inserted into the groove; and / or, an end of the first mounting part away from the limiting body is provided with a notch.

10. An endoscope assembly comprising: The protective sheath and the endoscope as claimed in any one of claims 1-9, the endoscope comprising an insertion part capable of being plugged into the plug-in interface and inserted into the sheath tube.

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