Disposable protective sleeve for gastroscope

By designing a disposable protective sleeve for gastroscopy and utilizing a three-way control valve in the air supply and exhaust pipes to achieve the functions of air inflation, air exhaust, and water flushing during gastroscopy, the problem of cumbersome disinfection after gastroscopy is solved, improving examination efficiency and reducing disinfection costs.

CN121890927APending Publication Date: 2026-04-21THE THIRD AFFILIATED HOSPITAL OF SUN YAT SEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
THE THIRD AFFILIATED HOSPITAL OF SUN YAT SEN UNIV
Filing Date
2026-02-13
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

The existing disinfection process after gastroscopy is cumbersome, time-consuming, and costly.

Method used

Design a disposable protective sleeve for gastroscopy that includes a protective sleeve body, an air supply tube, and an exhaust tube. It is connected to the air supply component and the negative pressure component through a three-way control valve to realize the functions of inflation, exhaust, flushing, and suction, thus avoiding contact between the gastroscopy and the human body.

Benefits of technology

The procedure simplifies the disinfection process after gastroscopy, reduces disinfection time and costs, and ensures safety and a clear view during the examination.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a disposable protective sleeve for a gastroscope, and relates to the technical field of medical instruments. The disposable protective sleeve for the gastroscope comprises a protective sleeve body, an air supply pipeline and an exhaust pipeline, the gastroscope is sleeved with the protective sleeve body, the air supply pipeline and the exhaust pipeline are arranged on the outer wall of the protective sleeve body, the air supply pipeline is connected with the air supply part through the three-way control valve, and a bypass control valve used for being connected with the liquid supply part is arranged on the air supply pipeline. And the exhaust pipeline is connected with the negative pressure piece through the three-way control valve. The technical effect that the gastroscope does not need to be frequently disinfected is achieved.
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Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a disposable protective sleeve for gastroscopes. Background Technology

[0002] Gastroscopy is a medical examination method, and also refers to the instrument used in this examination. It involves inserting a thin, flexible tube into the stomach, allowing doctors to directly observe lesions in the esophagus, stomach, and duodenum, especially small lesions. Gastroscopy allows direct observation of the examined area and, through pathological biopsy and cytological examination of suspicious lesions, further clarifies the diagnosis, making it the preferred examination method for upper gastrointestinal tract diseases.

[0003] However, existing gastroscopes require disinfection after the examination, and the existing disinfection process is cumbersome, time-consuming, and costly. Summary of the Invention

[0004] The purpose of this invention is to provide a disposable protective sleeve for gastroscopes to alleviate the technical problem of requiring frequent disinfection of gastroscopes in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a disposable protective sleeve for a gastroscope, comprising a protective sleeve body, an air supply tube, and an exhaust tube; The protective sleeve is fitted onto the endoscope, and both the air supply pipe and the exhaust pipe are located on the outer wall of the protective sleeve. The gas supply pipeline is connected to the gas supply component via a three-way control valve, and a bypass control valve for connecting to the liquid supply component is provided on the gas supply pipeline. The exhaust pipe is connected to the negative pressure component via a three-way control valve.

[0006] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the bottom of the three-way control valve is provided with a mounting base, which can be installed in the piston seat of the endoscope.

[0007] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the three-way control valve includes a valve body, a valve core, and a reset spring element; The valve core is inserted into the valve body, and the reset spring is disposed between the valve body and the valve core, so that the valve core has a tendency to pop out of the valve body; The valve body has a first vent hole and a second vent hole, and the valve core has a third vent hole and a fourth vent hole. The axes of the first vent hole, the second vent hole and the third vent hole are parallel, the axis of the fourth vent hole is perpendicular to the axis of the third vent hole, and the fourth vent hole passes through the valve core along the axial direction of the valve core. The outer wall of the valve core is provided with multiple sealing rings.

[0008] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the sealing ring includes a first sealing ring, a second sealing ring, and a third sealing ring; After the valve core descends, the first vent and the second vent are connected through the third vent, and the first vent, the second vent and the third vent are all located between the first sealing ring and the second sealing ring; After the valve core is reset and raised, the first vent and the second vent are separated. The first vent and the third vent are located between the first sealing ring and the second sealing ring, and the second vent is located between the second sealing ring and the third sealing ring.

[0009] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein a transparent cover is provided at the front end of the protective sleeve body.

[0010] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the front end of the aforementioned air supply pipeline is provided with a spray head for purging the transparent cover plate.

[0011] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the above-mentioned disposable gastroscopy protective sleeve further includes a storage component for storing the protective sleeve body.

[0012] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the above-mentioned receiving component includes a sleeve outer shell, a sleeve spring, and a connecting ring; The outer ring of the connecting ring is connected to one end of the sleeve shell, the inner ring of the connecting ring is connected to one end of the sleeve spring, and the protective sleeve body is sleeved on the outside of the sleeve spring. The inner diameter of the sleeve spring is not less than the outer diameter of the gastroscope.

[0013] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the sleeve housing includes a first housing and a second housing, wherein one end of the first housing and the second housing are pivotally connected and the other end is snapped together; Both the first outer shell and the second outer shell have a connecting half-ring at one end, and the two connecting half-rings are connected to form the connecting ring.

[0014] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein sealing protective covers are detachably installed at both ends of the aforementioned sleeve outer shell.

[0015] Beneficial effects: This invention provides a disposable protective sleeve for a gastroscope, comprising a protective sleeve body, an air supply line, and an exhaust line. The protective sleeve body is fitted onto the gastroscope, and the air supply line and exhaust line are both located on the outer wall of the protective sleeve body. The air supply line is connected to the air supply component via a three-way control valve, and a bypass control valve for connecting to the fluid supply component is provided on the air supply line. The exhaust line is connected to the negative pressure component via a three-way control valve.

[0016] Specifically, when using a gastroscopy, medical personnel place the protective sleeve over the endoscope and install the three-way control valves on both the air supply and exhaust lines inside the endoscope's piston seat. This allows medical personnel to easily control the three-way control valves on the air supply and exhaust lines while holding the endoscope. The air supply line also has a bypass control valve for connecting to the fluid supply unit. This setup allows for the completion of the necessary inflation, deflation, flushing, and aspiration procedures for gastroscopy. Furthermore, the protective sleeve completely protects the endoscope, preventing it from contacting the body and eliminating the need for disinfection after the examination. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a disposable protective sleeve for a gastroscope provided in an embodiment of the present invention; Figure 2 This is a schematic diagram showing the pressing of the three-way control valve in the disposable protective sleeve for gastroscopes provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the three-way control valve in the disposable protective sleeve for gastroscopy provided in an embodiment of the present invention when it is not pressed. Figure 4 This is a schematic diagram of the storage component in the disposable protective sleeve for gastroscopes provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the storage component in the disposable protective sleeve for gastroscopes provided in this embodiment of the invention during use; Figure 6 This is a schematic diagram of the pivot connection of the outer sleeve of the disposable protective sleeve for gastroscopes provided in an embodiment of the present invention; Figure 7 A schematic diagram of a gastroscope used with the disposable protective sleeve provided in an embodiment of the present invention.

[0019] icon: 10-Gastroscopy endoscope; 11-Piston seat; 12-Handle; 20-Air delivery component; 30-Negative pressure component; 100 - Protective case body; 110 - Transparent cover; 200 - Gas supply line; 300 - Exhaust pipe; 400 - Three-way control valve; 410 - Valve body; 411 - First vent; 412 - Second vent; 420 - Valve core; 421 - Third vent; 422 - Fourth vent; 423 - First sealing ring; 424 - Second sealing ring; 425 - Third sealing ring; 430 - Reset spring element; 500-Bypass control valve; 600 - Storage component; 610 - Sleeve outer shell; 611 - First outer shell; 612 - Second outer shell; 620 - Sleeve spring; 630 - Connecting ring; 640 - Sealing protective cover. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0025] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, this embodiment provides a disposable protective sleeve for a gastroscope, including a protective sleeve body 100, an air supply line 200, and an exhaust line 300. The protective sleeve body 100 is fitted onto the gastroscope 10. The air supply line 200 and the exhaust line 300 are both disposed on the outer wall of the protective sleeve body 100. The air supply line 200 is connected to the air supply component 20 via a three-way control valve 400, and a bypass control valve 500 for connecting to the liquid supply component is provided on the air supply line 200. The exhaust line 300 is connected to the negative pressure component 30 via the three-way control valve 400.

[0026] Specifically, when using the gastroscope 10, medical personnel place the protective sleeve 100 over the gastroscope 10 and install the three-way control valves 400 on both the air supply line 200 and the exhaust line 300 inside the piston seat 11 of the gastroscope 10. This allows medical personnel to easily control the three-way control valves 400 on the air supply line 200 and the exhaust line 300 when holding the gastroscope 10. The air supply line 200 is equipped with a bypass control valve 500 for connecting to the fluid supply device. Through this setup, the gastroscope 10 can perform the inflation, deflation, flushing, and aspiration operations required for the examination. Furthermore, the protective sleeve 100 can completely protect the gastroscope 10, preventing it from coming into contact with the human body. Therefore, it is not necessary to disinfect the gastroscope 10 after the examination.

[0027] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in an optional embodiment, the bottom of the three-way control valve 400 is provided with a mounting base, which can be installed in the piston seat 11 of the endoscope 10.

[0028] Specifically, a mounting base is provided at the bottom of the three-way control valve 400. The mounting base can be inserted into the piston seat 11 on the endoscope 10 body, thereby facilitating operation by medical personnel.

[0029] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in an optional embodiment, the three-way control valve 400 includes a valve body 410, a valve core 420, and a reset spring member 430. The valve core 420 is inserted into the valve body 410, and the reset spring member 430 is disposed between the valve body 410 and the valve core 420, so that the valve core 420 has a tendency to pop out of the valve body 410. The valve body 410 is provided with a first vent hole 411 and a second vent hole 412, and the valve core 420 is provided with a third vent hole 421 and a fourth vent hole 422. The axes of the first vent hole 411, the second vent hole 412, and the third vent hole 421 are parallel, and the axis of the fourth vent hole 422 is perpendicular to the axis of the third vent hole 421. The fourth vent hole 422 penetrates the valve core 420 along its axial direction. The outer wall of the valve core 420 is provided with multiple sealing rings.

[0030] The sealing rings include a first sealing ring 423, a second sealing ring 424, and a third sealing ring 425 arranged from top to bottom. After the valve core 420 descends, the first vent 411 and the second vent 412 are connected through the third vent 421. The first vent 411, the second vent 412, and the third vent 421 are all located between the first sealing ring 423 and the second sealing ring 424. After the valve core 420 returns to its original position and rises, the first vent 411 and the second vent 412 are separated. The first vent 411 and the third vent 421 are located between the first sealing ring 423 and the second sealing ring 424, and the second vent 412 is located between the second sealing ring 424 and the third sealing ring 425.

[0031] Specifically, after the endoscope 10 is turned on, the air supply component 20 and the negative pressure component 30 are activated. Both the air supply component 20 and the negative pressure component 30 are connected to the first vent 411 of the corresponding three-way control valve 400. At this time, the valve core 420 in the three-way control valve 400 is in a high position under the action of the reset spring component 430. At this time, the first vent 411 and the second vent 412 are separated, and the first vent 411 and the third vent 421 are located at the first sealing ring 423 and the second sealing ring 422. Between the sealing rings 424, the second vent 412 is located between the second sealing ring 424 and the third sealing ring 425. The first vent 411 is connected to the fourth vent 422 through the third vent 421. At this time, the gas blown out by the air delivery component 20 is discharged from the fourth vent 422 and will not enter the patient's body along the air delivery pipeline 200. Alternatively, at this time, the negative pressure component 30 draws outside air into the negative pressure component 30 through the fourth vent 422 and will not draw gas from the patient's body.

[0032] Additionally, when the user presses the three-way control valve 400, the valve core 420 moves into the valve body 410. At this time, the first vent 411 and the second vent 412 are connected through the third vent 421. The first vent 411, the second vent 412, and the third vent 421 are all located between the first sealing ring 423 and the second sealing ring 424. The third sealing ring 425 is located below the second sealing ring 424. At this time, the gas blown out by the air delivery component 20 flows from the third vent 421 to the second vent 412, and then flows from the second vent 412 into the air delivery pipeline 200, and then enters the patient's body through the air delivery pipeline 200. During this process, the medical staff continuously presses the corresponding three-way control valve 400. Alternatively, at this time, the negative pressure component 30 draws the gas out of the patient's body through the first vent 411, the third vent 421, and the fourth vent 422.

[0033] In addition, when it is necessary to inject liquid into the patient's body during the examination, the water injection device is connected to the air supply line 200 through the bypass control valve 500. Then, the user presses the three-way control valve 400 corresponding to the air supply line 200, at which time the liquid can enter the patient's body along with the gas.

[0034] The air supply component 20 can be a blower, and the negative pressure component 30 can be an exhaust fan. Furthermore, those skilled in the art can choose the type of air supply component 20 and negative pressure component 30 according to actual needs, which will not be elaborated further here.

[0035] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, in an optional embodiment, a transparent cover plate 110 is provided at the front end of the protective cover body 100.

[0036] Specifically, a transparent cover plate 110 is provided at the front end of the protective cover body 100. The transparent cover plate 110 ensures that the camera at the front end of the endoscope 10 can clearly observe the scene in front.

[0037] In an optional embodiment, the front end of the air supply pipeline 200 is provided with a spray head 120 for blowing the transparent cover plate 110.

[0038] Specifically, a spray head 120 is provided at the front end of the air supply line 200. The liquid sprayed from the spray head 120 can rinse the transparent cover plate 110 to ensure a clear view of the endoscope 10.

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in an optional embodiment, the disposable gastroscope protective sleeve also includes a storage component 600 for storing the protective sleeve body 100.

[0040] Specifically, it also includes a storage component 600, on which the protective sleeve body 100 is fitted. The storage component 600 not only protects the protective sleeve body 100, but also makes it easier for medical personnel to fit the protective sleeve body 100 onto the gastroscope 10.

[0041] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in the optional embodiment, the storage component 600 includes a sleeve shell 610, a sleeve spring 620, and a connecting ring 630; the outer ring of the connecting ring 630 is connected to one end of the sleeve shell 610, the inner ring of the connecting ring 630 is connected to one end of the sleeve spring 620, and the protective sleeve body 100 is sleeved on the outside of the sleeve spring 620; the inner diameter of the sleeve spring 620 is not less than the outer diameter of the gastroscope 10.

[0042] Specifically, a connecting ring 630 is provided at one end of the sleeve housing 610, and a sleeve spring 620 is provided on the connecting ring 630. The sleeve spring 620 is parallel to the inner wall of the sleeve housing 610, and the protective sleeve body 100 is fitted onto the sleeve spring 620. In use, the medical staff inserts the end of the sleeve housing 610 with the connecting ring 630 onto the gastroscope 10, and then makes the transparent cover plate 110 of the protective sleeve body 100 abut against the front end of the gastroscope 10. Then, the medical staff drags the sleeve housing 610 towards the handle of the gastroscope 10, so that the protective sleeve body 100 located between the sleeve housing 610 and the sleeve spring 620 is fitted onto the gastroscope 10.

[0043] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in the optional embodiment, the sleeve housing 610 includes a first housing 611 and a second housing 612. One end of the first housing 611 and the second housing 612 are pivotally connected, and the other end is snapped together. One end of both the first housing 611 and the second housing 612 is provided with a connecting half-ring, and the two connecting half-rings are connected to form a connecting ring 630.

[0044] Specifically, the sleeve outer shell 610 includes a first outer shell 611 and a second outer shell 612. One end of the first outer shell 611 and the second outer shell 612 are pivotally connected, and the other end is snapped together. With this arrangement, the sleeve outer shell 610 can be opened. After the protective sleeve body 100 is placed on the gastroscope 10 using the sleeve outer shell 610, medical personnel can open the sleeve outer shell 610 and then remove the sleeve outer shell 610 from the gastroscope 10.

[0045] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in an optional embodiment, sealing protective covers 640 are detachably installed at both ends of the sleeve housing 610.

[0046] Specifically, sealing protective covers 640 are provided at both ends of the sleeve outer shell 610. The sealing protective covers 640 are sealed to the sleeve outer shell 610, thereby sealing and protecting the protective sleeve body 100 inside the sleeve outer shell 610 to prevent contamination. When in use, medical personnel can simply remove the sealing protective covers 640.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A disposable protective sleeve for a gastroscope, characterized in that, include: Protective sleeve body (100), air supply pipe (200) and exhaust pipe (300); The protective sleeve body (100) is fitted onto the gastroscope (10), and both the air supply pipe (200) and the exhaust pipe (300) are located on the outer wall of the protective sleeve body (100). The gas supply line (200) is connected to the gas supply component (20) via a three-way control valve (400), and a bypass control valve (500) for connecting to the liquid supply component is provided on the gas supply line (200). The exhaust pipe (300) is connected to the negative pressure component (30) via a three-way control valve (400).

2. The disposable protective sleeve for gastroscopes according to claim 1, characterized in that, The bottom of the three-way control valve (400) is provided with a mounting base, which can be installed in the piston seat (11) of the endoscope (10).

3. The disposable protective sleeve for gastroscopes according to claim 1, characterized in that, The three-way control valve (400) includes a valve body (410), a valve core (420), and a reset spring element (430). The valve core (420) is inserted into the valve body (410), and the reset spring (430) is disposed between the valve body (410) and the valve core (420) so that the valve core (420) has a tendency to pop out of the valve body (410); The valve body (410) is provided with a first vent hole (411) and a second vent hole (412), and the valve core (420) is provided with a third vent hole (421) and a fourth vent hole (422). The axes of the first vent hole (411), the second vent hole (412) and the third vent hole (421) are parallel, and the axis of the fourth vent hole (422) is perpendicular to the axis of the third vent hole (421). The fourth vent hole (422) passes through the valve core (420) along the axial direction of the valve core (420). The outer wall of the valve core (420) is provided with multiple sealing rings.

4. The disposable protective sleeve for gastroscopes according to claim 3, characterized in that, The sealing rings include a first sealing ring (423), a second sealing ring (424), and a third sealing ring (425). After the valve core (420) descends, the first vent (411) and the second vent (412) are connected through the third vent (421). The first vent (411), the second vent (412) and the third vent (421) are all located between the first sealing ring (423) and the second sealing ring (424). After the valve core (420) is reset and raised, the first vent (411) and the second vent (412) are separated. The first vent (411) and the third vent (421) are located between the first sealing ring (423) and the second sealing ring (424), and the second vent (412) is located between the second sealing ring (424) and the third sealing ring (425).

5. The disposable protective sleeve for gastroscopes according to claim 1, characterized in that, The front end of the protective cover body (100) is provided with a transparent cover plate (110).

6. The disposable protective sleeve for gastroscopes according to claim 5, characterized in that, The front end of the air supply line (200) is provided with a spray head (120) for blowing the transparent cover plate (110).

7. The disposable protective sleeve for gastroscopes according to any one of claims 1-6, characterized in that, It also includes a storage component (600) for storing the protective case body (100).

8. The disposable protective sleeve for gastroscopes according to claim 7, characterized in that, The storage component (600) includes a sleeve housing (610), a sleeve spring (620), and a connecting ring (630). The outer ring of the connecting ring (630) is connected to one end of the sleeve shell (610), the inner ring of the connecting ring (630) is connected to one end of the sleeve spring (620), and the protective sleeve body (100) is sleeved on the outside of the sleeve spring (620). The inner diameter of the sleeve spring (620) is not less than the outer diameter of the gastroscope (10).

9. The disposable protective sleeve for gastroscopes according to claim 8, characterized in that, The sleeve housing (610) includes a first housing (611) and a second housing (612), with one end of the first housing (611) and the second housing (612) pivotally connected and the other end snapped together; Both the first outer shell (611) and the second outer shell (612) have a connecting half-ring at one end, and the two connecting half-rings are connected to form the connecting ring (630).

10. The disposable protective sleeve for gastroscopes according to claim 8, characterized in that, The sleeve housing (610) is detachably fitted with sealing protective covers (640) at both ends.