Disposable sheath for endoscope

Abstract

The invention relates to the technical field of medical instruments, and discloses a disposable sheath for an endoscope, the disposable sheath comprises an isolation sleeve, an elastic sealing sleeve and an isolation sheath, the isolation sleeve comprises a front end face and a connecting tube, the connecting tube is internally provided with an instrument channel and an endoscope channel which are separated from each other, and the front end face seals the front end of the endoscope channel; the front end of the elastic sealing sleeve is arranged on the outer side wall of the connecting pipe in a sealing and sleeving mode, the rear end of the elastic sealing sleeve extends in the direction away from the front end face, the front end of the isolation sheath is connected to an endoscope channel in a sealing mode, the rear end of the isolation sheath extends in the direction away from the front end face, and the front end face is of a transparent structure. The disposable sheath has the advantage of good observation effect.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a disposable sheath for endoscopes. Background Technology

[0002] Endoscopes, as core medical devices combining diagnostic and minimally invasive treatment functions, are widely used in clinical practice. During use, they come into direct contact with human tissues or bodily fluids. Currently, the industry primarily uses disposable sheaths on endoscopes to isolate them from the patient's internal environment, replacing the sheath after surgery to prevent cross-infection. For example, Chinese Patent CN215383914U discloses an endoscope with a disposable sheath. This design uses a sheath and end cap to fully cover the endoscope body and end cap, and a three-way sealing cap is installed at the forceps channel of the endoscope body. The forceps channel is connected to the three-way sealing cap, which is then fixed to a suction valve via a plug and suction tube, thus preventing the endoscope from directly contacting the patient's body fluids. However, this solution suffers from endoscopic field of view shift during surgery, resulting in poor observation and affecting surgical efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a disposable sheath for endoscopes, which offers the advantage of good observation results.

[0004] The specific technical solution of the present invention is as follows: a disposable sheath for an endoscope, comprising an isolation sleeve, an elastic sealing sleeve, and an isolation protective sleeve. The isolation sleeve includes a front end face and a connecting tube. The connecting tube has an instrument channel and an endoscope channel that are separated from each other. The front end face seals the front end of the endoscope channel. The front end of the elastic sealing sleeve is sealed on the outer wall of the connecting tube. The rear end of the elastic sealing sleeve extends away from the front end face. The front end of the isolation protective sleeve is sealed and connected to the endoscope channel. The rear end of the isolation protective sleeve extends away from the front end face. The front end face is a transparent structure.

[0005] In the aforementioned disposable sheath, the front end of the transparent structure serves as the observation surface of the endoscope. The endoscope lens is inserted into the endoscope channel through the isolation sheath until it reaches the front end. During this process, the elastic sealing sleeve is stretched axially. After the endoscope is inserted into place, the elastic sealing sleeve's rebound force keeps the front end and the endoscope lens pressed tightly together, with no gaps between them. This reduces reflections from the front end and improves the observation effect. At the same time, when the operator rotates the endoscope to change the observation angle during the operation, the elastic sealing sleeve's rebound force keeps the front end and the endoscope lens pressed tightly together, preventing any movement gaps that could cause the isolation sheath and the endoscope to deviate, resulting in a shaky or shifted field of view, thus improving the observation effect. In addition, the isolation sheath, endoscope channel, and front end face are sealed together to form the first barrier, completely enclosing the endoscope lens and the part that extends into the body. The elastic sealing sleeve seals the end of the connecting tube away from the front end face, forming an outer protection for the first barrier. This prevents contaminants from seeping in from the connection between the isolation sheath and the endoscope channel, thereby preventing the patient's tissues, body fluids, and other contaminants from coming into contact with the endoscope, improving the protective capability of the disposable protective sheath, and reducing the risk of cross-infection.

[0006] Optionally, the material of the isolation sleeve is an elastic material.

[0007] In the above technical solution, when the endoscope lens is inserted into the isolation sleeve, the isolation sleeve expands radially. After the endoscope lens is inserted into place, the isolation sleeve retracts radially, thus avoiding the waste of space caused by the rigid channel needing to adapt to the maximum outer diameter of the endoscope.

[0008] Optionally, the front end of the isolation sleeve is sealed and bonded to the inner wall of the endoscope channel; and / or, the front end of the elastic sealing sleeve is sealed and bonded to the outer wall of the connecting tube.

[0009] In the above technical solution, the sealing connection between the isolation sleeve and the endoscope channel, as well as the sealing connection between the elastic sealing sleeve and the connecting tube, are achieved by adhesive bonding. There is no need to set up a connection structure, which simplifies the structure and provides high connection strength and good sealing performance.

[0010] Optionally, the front end face is inclined relative to the connecting tube, and its inclination angle is consistent with the endoscope viewing angle.

[0011] In the above technical solution, the angle of the inclined surface of the front end is consistent with the viewing angle of the endoscope, so that the transparent front end covers the observation angle of the endoscope and ensures that the lens can clearly capture the preset diagnostic and treatment field of view through the inclined surface.

[0012] Optionally, the instrument channel is connected to an instrument channel tube, the rear end of which extends away from the front end, and the instrument channel tube is made of an elastic material.

[0013] In the above technical solution, the instrument channel is equipped with an instrument channel tube. The instrument enters the instrument channel through the instrument channel tube, which integrates the dual functions of observation and surgical operation of the disposable sheath. The instrument channel tube is made of elastic material. When the instrument is inserted into the instrument channel tube, the instrument channel tube expands elastically. After the instrument passes through, the instrument channel tube automatically springs back to its original position, which not only ensures the smooth passage of the instrument, but also reduces the radial space occupied by the tube itself.

[0014] Optionally, the instrument channel tube is sealed to the instrument channel.

[0015] In the above technical solution, during the operation of the instrument, contaminants will enter the instrument channel tube from the opening of the instrument channel, forming a continuous entry path for contaminants, thus avoiding the risk of contaminants coming into contact with the endoscope from between the endoscope channel and the isolation sheath.

[0016] Optionally, it also includes an outer tube, a connecting assembly, an endoscope docking assembly, and an instrument docking assembly. The outer tube, the endoscope docking assembly, and the instrument docking assembly are all connected to the connecting assembly. The isolation sleeve is sealed to the end of the outer tube away from the connecting assembly through an elastic sealing sleeve. The rear end of the isolation sleeve passes through the interior of the outer tube.

[0017] In the above technical solution, the outer tube is used to strengthen the strength of the insertion component. The outer tube is sleeved outside the isolation sleeve to prevent the isolation sleeve from collapsing or twisting during the insertion of the endoscope. The isolation sleeve, the elastic sealing sleeve and the outer tube are sealed together to form the outer barrier of the first isolation barrier.

[0018] Optionally, the instrument docking assembly includes an instrument channel connector, a tee, and a valve sleeve assembly. The front end of the tee is connected to the instrument channel tube through the instrument channel connector, and the rear end of the tee is connected to the valve sleeve assembly. The tee is provided with a liquid inlet for liquid input and output.

[0019] In the above technical solution, the three-way fitting enables the instrument channel tube to integrate the dual functions of liquid inlet / outlet and instrument inlet, thus achieving functional reuse; the valve sleeve assembly is the inlet end of the instrument.

[0020] Optionally, the end face dimension of the isolation sleeve near the outer tube is larger than the inner diameter of the outer tube.

[0021] In the above technical solution, since the isolation sleeve and the outer tube are connected by an elastic sealing sleeve, when the isolation sleeve is subjected to external force, the isolation sleeve will slide toward the outer tube. The end face size of the isolation sleeve is larger than the inner diameter of the outer tube, so that the isolation sleeve will not enter the outer tube.

[0022] Optionally, the endoscope docking assembly includes an endoscope docking tube, with the rear end of the isolation sheath passing through the outer tube and docking with the endoscope docking tube in a sealed connection. The endoscope docking assembly and the endoscope are fastened together by a snap-fit ​​and slot structure.

[0023] In the above technical solution, the isolation sleeve, isolation sheath, and endoscope docking tube seal form a continuous sealing barrier, ensuring that the part of the endoscope inserted into the sheath is completely wrapped with no exposed area; after the endoscope is inserted into place, the endoscope docking assembly is fastened to the endoscope through a snap-fit ​​and slot structure, which is quick and convenient to connect and avoids the shaking of the field of vision caused by the displacement of the endoscope during the operation.

[0024] Compared with the prior art, the present invention has at least the following advantages: (1) Both the isolation sleeve and the elastic sealing sleeve are made of elastic material. The endoscope lens is inserted into the endoscope channel through the isolation sleeve until the front end face. During this process, the isolation sleeve and the elastic sealing sleeve unfold along the axis. After the endoscope is inserted into place, the rebound force of the isolation sleeve and the elastic sealing sleeve makes the front end face press against the endoscope lens. There is no gap between the two, which reduces the reflection of the front end face. During the operation, the isolation sleeve and the endoscope rotate synchronously, resulting in good observation effect. (2) The disposable sheath assembly has two barriers to isolate the endoscope. The first barrier consists of an isolation sheath, an isolation sheath and an endoscope docking assembly, which completely wraps the endoscope lens and the part that extends into the body, directly isolating the endoscope from the patient's tissues, body fluids and other contaminants. The second barrier consists of an isolation sheath, an elastic sealing sheath, an outer tube and an instrument channel tube, forming an outer barrier to the first barrier, preventing contaminants from seeping in from the connection between the isolation sheath and the endoscope channel. In addition, the port of the isolation sheath near the front end is further forward than the port of the instrument channel tube near the front end, in order to avoid the risk of the endoscope being contaminated by contaminants entering the instrument channel. (3) The disposable sheath assembly has a dual channel, which can realize the functions of observation and surgical operation. The instrument channel tube integrates the dual functions of liquid inlet and outlet and instrument inlet, realizing functional reuse and simplifying the structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure when the disposable sheath of the present invention is connected to the endoscope; Figure 2 This is a schematic diagram of the structure of the disposable sheath of the present invention; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a cross-section of the disposable sheath of the present invention. Figure 1 ; Figure 5 This is a cross-section of the disposable sheath of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the endoscope docking assembly and endoscope of the present invention. Figure 1 ; Figure 7This is a schematic diagram of the endoscope docking assembly and endoscope of the present invention. Figure 2 .

[0026] In the diagram: 1. Isolation sleeve; 11. Front end face; 12. Connecting tube; 13. Instrument channel; 14. Endoscope channel; 15. Port; 2. Elastic sealing sleeve; 3. Outer tube; 4. Connecting assembly; 6. Instrument docking assembly; 61. Instrument channel connector; 62. T-joint; 63. Valve sleeve assembly; 631. Check valve; 632. Cover; 633. Valve sleeve; 64. Fluid inlet; 7. Endoscope docking assembly; 71. Buckle; 72. Positioning pin; 73. Endoscope docking tube; 8. Instrument channel tube; 9. Isolation sleeve; 100. Endoscope; 101. Positioning groove; 102. Locking block. Detailed Implementation

[0027] The present invention will now be described through specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in the present invention, and the scope of protection of the present invention is defined by the appended claims and any equivalents thereof.

[0028] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Unless otherwise specified, the raw materials and equipment used in this invention are conventional in the art and can be obtained through conventional commercial means; unless otherwise specified, the methods used in this invention are conventional methods in the art.

[0029] In the following embodiments, "front end" refers to the end facing the inside of the human body during surgery; "rear end" refers to the end away from the inside of the human body during surgery.

[0030] Example 1: Refer to Figures 1 to 7 This invention provides a disposable sheath for an endoscope, comprising an isolation sleeve 1, an elastic sealing sleeve 2, and an isolation sheath 9. The isolation sleeve 1 includes a front end face 11 and a connecting tube 12. The connecting tube 12 has a mutually separated instrument channel 13 and endoscope channel 14. The front end face 11 seals the front end of the endoscope channel 14. The front end of the elastic sealing sleeve 2 is sealed and fitted onto the outer wall of the connecting tube 12, and the rear end of the elastic sealing sleeve 2 extends away from the front end face 11. The front end of the isolation sheath 9 is sealed and connected to the inner wall of the endoscope channel 14, and the rear end of the isolation sheath 9 extends away from the front end face 11. The front end face 11 is transparent. The endoscope 100 can be an electronic endoscope or an optical endoscope.

[0031] In this embodiment, the isolation sleeve 1 is a one-piece molded structure; the elastic sealing sleeve 2 is made of rubber. In order to realize the observation function of the endoscope 100, at least the front end face 11 of the isolation sleeve 1 is a transparent structure. In this embodiment, the isolation sleeve 1 is entirely transparent, and the isolation sleeve 1 is made of transparent plastic with a light transmittance of ≥90%, such as PMMA, PC, PET, etc.

[0032] In the aforementioned disposable sheath, the transparent front end face 11 serves as the observation surface of the endoscope 100. The lens of the endoscope 100 is inserted into the endoscope channel 14 through the isolation sheath 9 until it reaches the front end face 11. Since the length of the inserted part of the endoscope is longer than that of the isolation sheath, the elastic sealing sleeve 2 is stretched axially during this process. After the endoscope 100 is inserted into place, the rebound force of the elastic sealing sleeve 2 makes the front end face 11 and the lens of the endoscope press tightly together, with no gap between them. This reduces the reflection of the front end face 11 and improves the observation effect. At the same time, when the operator rotates the endoscope 100 to change the observation angle during the operation, the front end face 11 and the lens of the endoscope 100 remain pressed tightly together under the action of the rebound force of the elastic sealing sleeve 2. This prevents the isolation sheath 1 and the endoscope 100 from moving due to gaps, which would cause the field of view to shake or shift, thus improving the observation effect. In addition, the isolation sleeve 9, endoscope channel 14 and front end face 11 are sealed together to form the first barrier, completely covering the endoscope 100 lens and the part that extends into the body. The elastic sealing sleeve 2 seals the end of the connecting tube 12 away from the front end face 11, forming an outer protection for the first barrier, preventing contaminants from seeping in from the connection between the isolation sleeve 9 and the endoscope channel 14, thereby preventing the patient's tissues, body fluids and other contaminants from coming into contact with the endoscope 100, improving the protective ability of the disposable protective sleeve and reducing the risk of cross-infection.

[0033] Furthermore, the isolation sleeve 9 is made of rubber. When the lens of the endoscope 100 is inserted into the isolation sleeve 9, the isolation sleeve 9 expands radially. After the lens of the endoscope 100 is fully inserted, the isolation sleeve 9 retracts radially, thus avoiding the waste of space caused by the rigid channel needing to adapt to the maximum outer diameter of the endoscope 100.

[0034] In a preferred embodiment of the present invention, a disposable sheath for an endoscope includes an isolation sleeve 1, an elastic sealing sleeve 2, an isolation sheath 9, an instrument channel tube 8, an outer tube 3, a connecting assembly 4, an endoscope docking assembly 7, and an instrument docking assembly 6. The connecting assembly 4 serves as a connecting base for each component; the instrument docking assembly 6 is used to insert instruments for surgical operations; the endoscope docking assembly 7 is used to insert and connect to the endoscope 100; and the outer tube 3 is used to reinforce the strength of the inserted components.

[0035] like Figure 2As shown, the outer tube 3, endoscope docking assembly 7, and instrument docking assembly 6 are all connected to the connecting assembly 4. The outer tube 3 is located at the front end of the connecting assembly 4, while the instrument docking assembly 6 and endoscope docking assembly 7 are located at the rear end of the connecting assembly 4. The isolation sleeve 1 is sealed to the end of the outer tube 3 away from the connecting assembly 4 via the elastic sealing sleeve 2. The rear end of the isolation sleeve 9 passes through the interior of the outer tube 3. The outer tube 3 is fitted over the isolation sleeve 9 to prevent the isolation sleeve 9 from collapsing or twisting during the insertion of the endoscope 100. The isolation sleeve 1, elastic sealing sleeve 2, and outer tube 3 are sealed together, forming the outer barrier of the first isolation barrier. This invention does not limit the specific connection method between the elastic sealing sleeve 2 and the outer tube 3. Commonly used sealing connection methods in the art all fall within the protection scope of this invention. It is only necessary to ensure that the elastic sealing sleeve 2 and the outer tube 3 can achieve the sealing and protection function of the second isolation barrier after being connected. As an example, the elastic sealing sleeve 2 and the outer tube 3 are sealed together by adhesive bonding.

[0036] like Figure 2 and Figure 4 As shown, the instrument docking assembly 6 includes an instrument channel connector 61, a tee connector 62, and a valve sleeve assembly 63. The front end of the tee connector 62 connects to the instrument channel tube 8 via the instrument channel connector 61, and the rear end of the tee connector 62 connects to the valve sleeve assembly 63. The remaining end of the tee connector 62 is provided with a liquid inlet 64 for liquid input and output, allowing instruments and liquids to enter and exit through the instrument channel tube 8. The tee connector 62 integrates the dual functions of liquid input / output and instrument input into the instrument channel tube 8, achieving functional reuse. The valve sleeve assembly 63 is the instrument input end.

[0037] In this embodiment, the valve sleeve assembly 63 includes a valve sleeve 633 and a cover 632. A one-way valve 631 is provided inside the valve sleeve 633. The cover 632 and the one-way valve 631 are made of silicone. The valve sleeve 633 has a groove, and the cover 632 has a corresponding embedding step. The groove is designed to be slightly smaller than the size of the embedding step. During assembly, a seal is formed by interference compression. In addition, a boss is provided at the position where the cover 632 abuts against the end face of the valve sleeve 633 to fill the gap between the end face of the cover 632 and the end face of the valve sleeve 633, blocking the path of liquid leakage from the valve sleeve assembly 63.

[0038] like Figure 1 , Figure 6 and Figure 7As shown, the endoscope docking assembly 7 includes an endoscope docking tube 73. The rear end of the isolation sleeve 9 passes through the outer tube 3 and is then docked and sealed to the endoscope docking tube 73. The endoscope docking assembly 7 and the endoscope 100 are fastened together by a snap-fit ​​71 and a slot structure. After the endoscope 100 is inserted into place, the endoscope docking assembly 7 and the endoscope 100 are fastened together by the snap-fit ​​71 and the slot structure, making the connection quick and convenient and avoiding visual field shaking caused by the displacement of the endoscope 100 during surgical operations. It should be noted that the present invention does not limit the specific connection structure. Commonly used fastening structures in the art all fall within the protection scope of the present invention. As an example, the endoscope docking assembly 7 is provided with two circumferentially arranged buckles 71, and a positioning pin 72 is provided at the interval between the buckles 71. The endoscope 100 is provided with a locking block 102 and a positioning groove 101 on the side facing the endoscope docking assembly 7. When connecting, the positioning pin 72 enters the positioning groove 101, and the lens end of the endoscope 100 passes from the endoscope docking tube 73 to the isolation sleeve 1. Then, the locking block 102 is locked into the buckle 71 to realize the connection between the two.

[0039] In this embodiment, the end face size of the isolation sleeve 1 near the outer tube 3 is larger than the inner diameter of the outer tube 3. Since the isolation sleeve 1 and the outer tube 3 are connected by an elastic sealing sleeve 2, when the isolation sleeve 1 is subjected to external force, the isolation sleeve 1 will slide toward the outer tube 3. The end face size of the isolation sleeve 1 being larger than the inner diameter of the outer tube 3 prevents the isolation sleeve 1 from entering the outer tube 3.

[0040] like Figure 3 As shown, the front end face 11 of the isolation sleeve 1 is inclined relative to the connecting tube 12, and its inclination angle is consistent with the viewing angle of the endoscope 100, so that the transparent front end face 11 covers the observation angle of the endoscope 100, ensuring that the lens can clearly capture the preset diagnostic field of view through the inclined surface.

[0041] In this embodiment, the front end of the isolation sleeve 9 is sealed and glued to the inner wall of the endoscope channel 14; the front end of the elastic sealing sleeve 2 is sealed and glued to the outer wall of the connecting tube 12. The sealing connection between the isolation sleeve 9 and the endoscope channel 14, as well as the sealing connection between the elastic sealing sleeve 2 and the connecting tube 12, is achieved through gluing. This eliminates the need for a separate connection structure, simplifying the structure and providing strong connection and good sealing performance. It is understood that the isolation sleeve 9 and the endoscope channel 14, or the elastic sealing sleeve 2 and the connecting tube 12, can also employ other known sealing connection methods in the art.

[0042] like Figure 4 and Figure 5As shown, an instrument channel tube 8 is connected to the instrument channel 13. The rear end of the instrument channel tube 8 extends away from the front end face 11, and the front end of the instrument channel tube 8 extends into the instrument channel 13 and connects to the instrument channel 13. The rear end is connected to the tee member 62 through the instrument channel connector 61. The instrument channel 13 is provided with an instrument channel tube 8, and instruments enter the instrument channel 13 through the instrument channel tube 8, so that the disposable sheath integrates the dual functions of observation and surgical operation.

[0043] Furthermore, the instrument channel tube 8 is made of rubber. When the endoscope 100 is inserted into the disposable sheath, the instrument channel tube 8 is compressed and deformed, but its height is still sufficient to insert the designed instrument. When the instrument is inserted into the instrument channel tube 8, the instrument channel tube 8 elastically expands, and after the instrument passes through, the instrument channel tube 8 automatically springs back to its original position, which not only ensures the smooth passage of the instrument, but also reduces the radial space occupied by the tube itself.

[0044] Both the isolation sleeve 9 and the instrument channel tube 8 are elastic structures. When the instrument or endoscope 100 lens passes through, the two avoid rigid collisions by elastically yielding, thus avoiding the waste of space caused by the rigid channel needing to adapt to the maximum outer diameter of the endoscope 100, and achieving efficient use of limited space.

[0045] Preferably, the instrument channel tube 8 is sealed to the instrument channel 13. The end of the instrument channel tube 8 near the front end face 11 is further away from the front end face 11 in the axial position than the end of the isolation sleeve 9 near the front end face 11. The instrument channel tube 8 and the instrument channel 13 form a continuous entry path for contaminants, avoiding the risk of contaminants contacting the endoscope 100 between the endoscope channel 14 and the isolation sleeve 9.

[0046] like Figure 3 and Figure 5 As shown, a port 15 is provided on the tip face 11. The port 15 is connected to the instrument channel 13 and is used for the instruments in the instrument channel 13 to extend out of the isolation sleeve 1 for operation, or to input and discharge liquid.

[0047] In this embodiment, the disposable sheath has two barriers to isolate the endoscope 100. The first barrier consists of the isolation sheath 9, the isolation sleeve 1, and the endoscope connecting tube 73, which completely wraps the endoscope 100 lens and the part that extends into the body, directly isolating the endoscope 100 from contaminants such as patient tissues and body fluids. The second barrier consists of the isolation sleeve 1, the elastic sealing sleeve 2, the outer tube 3, and the instrument channel tube 8. The isolation sleeve 1, the elastic sealing sleeve 2, and the outer tube 3 form an outer barrier to the first barrier. The instrument channel tube 8 and the instrument channel 13 inside the isolation sleeve 1 form a continuous entry path for contaminants at the opening 15, which together prevents contaminants from seeping in from the connection between the isolation sheath 9 and the endoscope channel 14. In addition, the port of the isolation sheath 9 near the front end face 11 is further forward than the port of the instrument channel tube 8 near the front end face 11, in order to avoid the risk of the endoscope 100 being contaminated by contaminants entering the instrument channel 13.

[0048] The disposable sheath in this embodiment has two channels, which can realize the functions of observation and surgical operation. The observation channel consists of the endoscope connecting tube 73, the isolation sheath 9, the endoscope channel 14 of the isolation sheath 1 and the front end face 11, forming a straight channel. The lens end of the endoscope 100 is inserted into the endoscope channel 14 from the endoscope connecting tube 73 and fits against the front end face 11. The surgical operation channel consists of a valve sleeve assembly 63, a three-way connector 62, an instrument channel connector 61, an instrument channel tube 8, an instrument channel 13, and an opening 15 of an isolation sleeve 1. The instrument channel tube 8 is a flexible hose. After assembly, the instrument channel tube 8 is bent to accommodate its spatial arrangement with the instrument channel connector 61. Liquid enters from the liquid inlet 64 of the three-way connector 62, flows through the instrument channel connector 61, the instrument channel tube 8, and the instrument channel 13, and flows out from the opening 15. The liquid aspiration process is the reverse. Instruments enter from the valve sleeve assembly 63, flow through the three-way connector 62, the instrument channel connector 61, the instrument channel tube 8, and the instrument channel 13, and extend out from the opening 15.

[0049] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A disposable sheath for an endoscope, characterized in that, The device includes an isolation sleeve (1), an elastic sealing sleeve (2), and an isolation sheath (9). The isolation sleeve (1) includes a front end face (11) and a connecting tube (12). The connecting tube (12) has an instrument channel (13) and an endoscope channel (14) that are separated from each other. The front end face (11) seals the front end of the endoscope channel (14). The front end of the elastic sealing sleeve (2) is sealed on the outer wall of the connecting tube (12). The rear end of the elastic sealing sleeve (2) extends away from the front end face (11). The front end of the isolation sheath (9) is sealed and connected to the endoscope channel (14). The rear end of the isolation sheath (9) extends away from the front end face (11). The front end face (11) is a transparent structure.

2. The disposable sheath for an endoscope according to claim 1, characterized in that, The material of the isolation sheath (9) is an elastic material.

3. A disposable sheath for an endoscope according to claim 1, characterized in that, The front end of the isolation sleeve (9) is sealed and glued to the inner wall of the endoscope channel (14); and / or, the front end of the elastic sealing sleeve (2) is sealed and glued to the outer wall of the connecting tube (12).

4. A disposable sheath for an endoscope according to claim 1, characterized in that, The front end face (11) is inclined relative to the connecting tube (12), and its inclination angle is consistent with the viewing angle of the endoscope (100).

5. A disposable sheath for an endoscope according to claim 1, characterized in that, The instrument channel (13) is connected to an instrument channel tube (8).

6. A disposable sheath for an endoscope according to claim 5, characterized in that, The instrument channel tube (8) is sealed to the instrument channel (13). The end of the instrument channel tube (8) near the front end face (11) is further away from the front end face (11) in the axial position than the end of the isolation sleeve (9) near the front end face (11).

7. A disposable sheath for an endoscope according to any one of claims 1 to 6, characterized in that, It also includes an outer tube (3), a connecting assembly (4), an endoscope docking assembly (7) and an instrument docking assembly (6). The outer tube (3), the endoscope docking assembly (7) and the instrument docking assembly (6) are all connected to the connecting assembly (4). The isolation sleeve (1) is sealed to the end of the outer tube (3) away from the connecting assembly (4) through an elastic sealing sleeve (2). The rear end of the isolation sleeve (9) passes through the interior of the outer tube (3).

8. A disposable sheath for an endoscope according to claim 7, characterized in that, The instrument docking assembly (6) includes an instrument channel connector (61), a tee (62) and a valve sleeve assembly (63). The front end of the tee (62) is connected to the instrument channel tube (8) through the instrument channel connector (61), and the rear end of the tee (62) is connected to the valve sleeve assembly (63). The tee (62) is provided with a liquid inlet (64) for liquid input and output.

9. A disposable sheath for an endoscope according to claim 7, characterized in that, The end face dimension of the isolation sleeve (1) near the outer tube (3) is larger than the inner diameter of the outer tube (3).

10. A disposable sheath for an endoscope according to claim 7, characterized in that, The endoscope docking assembly (7) includes an endoscope docking tube (73). The rear end of the isolation sleeve (9) passes through the outer tube (3) and is docked with the endoscope docking tube (73) in a sealed connection. The endoscope docking assembly (7) and the endoscope (100) are fastened together by a snap-fit ​​(71) and a slot structure.

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