Digestive tract foreign body taking-out device based on endoscope

Abstract

The invention relates to the technical field of digestive system department instruments, and particularly provides an endoscope-based digestive tract foreign body taking-out device which comprises a pedal type positive and negative pressure device, a liquid storage pressure stabilizing device, an infusion tube and a bag. The vacuumized and pre-compressed bag is conveyed to the position below the foreign matter through the endoscope channel, the pedal device is used for driving liquid to enable the bag to be expanded to form a cup-shaped lifting structure, and therefore the foreign matter is stably captured and retreats along with the endoscope. The device effectively solves the problem of sliding in the foreign matter taking-out process, and is convenient to operate and high in safety.

Description

Technical Field

[0001] This invention belongs to the field of gastroenterology instrument technology, specifically relating to an endoscope-based device for removing foreign bodies from the digestive tract. Background Technology

[0002] Endoscopic diagnostic and treatment techniques are widely used to detect and treat gastrointestinal diseases. An endoscopic system mainly consists of a main unit and a scope. The scope has an operating section, which in turn has a connecting section and an insertion section. The connecting section connects to the main unit, and the insertion section is used for insertion into the body. The front end of the insertion section also has an objective lens, a light guide lens, etc. The operating section also has an instrument insertion port, which communicates with the instrument channel inside the insertion section for instrument insertion, allowing the instrument to follow the insertion section into the body.

[0003] Foreign bodies in the digestive tract are a common clinical emergency. These bodies are primarily lodged in the upper digestive tract, especially the esophagus. A wide variety of foreign bodies can be found, including animal bones, fruit pits, and fish bones. Children and the elderly are the most frequent sufferers of foreign bodies lodged in the digestive tract. Typically, the foreign body does not completely block the digestive tract; it usually only makes partial contact with the lining, maintaining a distance. When a foreign body is lodged in the digestive tract, it is usually removed using an endoscope combined with clamping instruments. For example, patent document CN221786560U discloses an endoscopic foreign body clamping device that uses clamps to hold the foreign body. However, this type of clamping structure is not suitable for foreign bodies with smooth surfaces. To address this issue, patent document CN119791806B discloses a foreign body removal device for gastroenterology and its manufacturing method. This device utilizes an air bladder to encapsulate and clamp the foreign body. The air bladder has a large clamping surface and forms an isolation layer between the foreign body and the digestive tract, preventing the foreign body from falling out or scratching the digestive tract. However, during operation, the air bladder needs to be aligned with the foreign body before clamping. During this process, the air bladder needs to inflate, which can open the digestive tract. The foreign body may continue to slide down the digestive tract while still unclamped, posing a significant risk. Therefore, a device is needed to effectively prevent the accidental dislodgement of foreign bodies from the digestive tract during removal, thereby reducing this risk. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides an endoscope-based foreign body removal device for the digestive tract. By inserting a negative pressure contraction sac under the foreign body in the digestive tract, and then expanding it to lift the foreign body, the device removes the foreign body along with the sac from the digestive tract, thus solving the problem of the foreign body continuing to slide down the digestive tract during the removal process.

[0005] This invention proposes an endoscopic-based foreign body removal device for the digestive tract, comprising: a foot-operated positive and negative pressure device, a fluid storage and pressure stabilizing device, an infusion tube, and a pouch; the foot-operated positive and negative pressure device includes a foot-operated airbag, a one-way inlet valve and a one-way outlet valve disposed on the foot-operated airbag, and an infusion tube communicating with the one-way inlet valve or the one-way outlet valve; the fluid storage and pressure stabilizing device includes a rigid tank and a flexible fluid storage bag disposed inside the rigid tank; one end of the rigid tank is connected to the infusion tube, and the other end is provided with a negative pressure interface and a positive pressure interface; one end of the flexible fluid storage bag is provided with a bag outlet, which is connected to the positive pressure interface; the flexible fluid storage bag stores... The infusion tube contains a liquid; end caps are provided at the ends of the negative pressure and positive pressure interfaces; the front end of the infusion tube is connected to the pouch, and a sealing film is provided at the rear end of the infusion tube to maintain the infusion bag and the pouch in a vacuum pre-compressed state; the rear end of the infusion tube is adapted to the negative pressure and positive pressure interfaces; a metal wire is fixedly provided on the side wall of the infusion tube, and the front end of the metal wire extends out of the infusion tube and connects to the side wall of the pouch; the infusion tube with the metal wire and the pouch in a vacuum pre-compressed state are configured to allow insertion into the instrument channel of the endoscope's operating section from the instrument insertion port and to extend out from the front end of the insertion section.

[0006] Furthermore, the internal space of the sac expands after being filled with liquid to form a cup-shaped structure; the cup-shaped structure has a notch at the mouth and the adjacent sidewall.

[0007] After inflating, the capsule fills with liquid, forming a cup-shaped structure with notches at the rim and on the adjacent sidewalls. The cup-shaped structure provides a larger contact surface, while the notches allow the capsule to adapt to irregularly shaped foreign objects during inflatation, preventing pressure concentration and reduced fit caused by complete closure. Therefore, the cup-shaped structure improves the stability and containment of the capsule, while the notches increase its flexibility, allowing it to better conform to the foreign object and the digestive tract wall, reducing the possibility of slippage, especially suitable for foreign objects with sharp edges or irregular shapes.

[0008] Furthermore, the liquid stored in the flexible storage bag is a lubricant; the outer wall of the cup-shaped structure is provided with a plurality of overflow holes spaced apart along the circumference; the outer wall of each overflow hole is covered with an adsorption film, and the adsorption film is only adhered to the bag at its upper end.

[0009] When the capsule expands and fluid is continued to be supplied, the adsorption membrane is pushed open, and the lubricant slowly seeps out through the overflow hole. The lubricant reduces friction between the capsule and the digestive tract wall, facilitating a smooth removal of foreign objects; the adsorption membrane prevents premature or excessive release of lubricant, ensuring continuous and uniform lubrication, and reducing tissue damage and discomfort.

[0010] Furthermore, the portion of the metal wire extending out of the infusion tube is adhered to the side wall of the cup-shaped structure, and the front end of the metal wire extends to be fixedly connected to the bottom of the cup-shaped structure.

[0011] Metal wires guide the bladder to the target position and control its unfolding shape to ensure that the bladder forms an ideal cup-shaped structure when inflated, thus improving lifting accuracy.

[0012] Furthermore, the rigid tank includes a tank body and a cover body connected by threads; the cover body is provided with the negative pressure interface and the positive pressure interface; both the negative pressure interface and the positive pressure interface are tubular structures and are equipped with threaded structures; the outlet of the flexible liquid storage bag is threadedly connected to the positive pressure interface; the rear end of the infusion tank is equipped with a threaded structure.

[0013] The threaded connection allows for quick disassembly and assembly, facilitating cleaning, disinfection, or replacement of the flexible reservoir bag, improving the maintainability and reusability of the device, and meeting hygiene standards for medical devices.

[0014] Furthermore, the negative pressure interface is a flexible tube with an L-shaped spike on its inner wall. The tip of the spike is flush with the end of the negative pressure interface and is used to puncture the sealing film.

[0015] When the infusion tubing is connected to the negative pressure interface, the spike punctures the sealing film, releasing the vacuum. This simplifies the operation process and improves efficiency, especially by shortening the connection time between the infusion tubing and the negative pressure interface. It allows the negative pressure interface to be connected instantly when the infusion tubing fails, enabling the tubing to quickly maintain negative pressure and reducing the risk of premature bag inflation.

[0016] Furthermore, a filter layer is provided inside the positive pressure interface.

[0017] The filter layer blocks impurities, particles, or microorganisms from entering the infusion tubing, preventing contamination of the bag or digestive tract, reducing the risk of infection, and ensuring the safety and hygiene of the procedure.

[0018] Furthermore, an air inlet is provided at the end of the tank away from the cover, and the air inlet is connected to the air supply pipe.

[0019] Furthermore, at least one side of the tank is a transparent plastic plate, and the flexible liquid storage bag is a transparent bag.

[0020] Furthermore, the metal wire is a flexible metal wire.

[0021] The flexible design of the wire allows it to deform flexibly when passing through the curved channels of the endoscope without causing permanent deformation or damage. The flexible wire provides the necessary support for the infusion tubing, adapts to the complex path of the endoscope, reduces friction between the device and the channel, lowers the risk of instrument damage and tissue trauma, and can also adapt to the curved anatomy of the digestive tract.

[0022] The beneficial effects of this invention are as follows: the capsule expands beneath the foreign object to form a lifting structure, capturing the foreign object and removing it along with the capsule. The capsule is initially in a vacuum-pre-compressed state and is introduced into the digestive tract through an infusion tube. Upon reaching the foreign object, a foot-operated positive and negative pressure device applies positive pressure, causing liquid to enter the capsule and expand it into a cup-shaped structure. This cup-shaped structure stably lifts the foreign object, preventing it from slipping due to gravity or peristalsis during removal. The capsule's expansion and lifting mechanism directly addresses the root cause of foreign object slippage, ensuring the object remains stable during removal through physical support and encapsulation, thus improving the success rate of removal and reducing the risk of repeated operations. The liquid storage and pressure stabilizing device includes a rigid tank and an internal flexible liquid storage bag. The rigid tank is connected to the gas and infusion tubes via negative and positive pressure interfaces, while the flexible liquid storage bag stores liquid (such as lubricant). When positive pressure is applied, the flexible storage bag is stably compressed, and the liquid flows into the bladder through the positive pressure port. When negative pressure is applied, the bladder remains contracted, preventing premature expansion within the digestive tract. When the foot-operated positive and negative pressure device inflates the rigid container through the gas delivery tube, the compressed air acts evenly on the outer surface of the flexible storage bag, creating a stable pressure environment. This allows the liquid inside the flexible storage bag to be continuously and steadily supplied to the bladder through the delivery tube. Especially when the bladder is equipped with an overflow hole, the lubricant inside the flexible storage bag is stably output through the overflow hole, buffering pressure fluctuations and ensuring lubrication while improving operational safety. In addition, compared to traditional handheld or electrically controlled positive and negative pressure devices, the foot-operated positive and negative pressure device frees up the hands and is more convenient to operate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the digestive tract foreign body removal device of the present invention after assembly with the endoscope body; Figure 2 This is a schematic diagram of the infusion tube and bag of the present invention; Figure 3 This is a cross-sectional view of the liquid storage and pressure stabilizing device of the present invention; Figure 4 for Figure 3 A schematic diagram of the structure where the tank body and lid are separated; Figure 5 for Figure 4 A schematic diagram of the structure where the flexible liquid storage bag is separated from the cap; Figure 6 Figure 5 Enlarged structural diagram of the middle cover; Figure 7 This is a schematic diagram of the structure of the bag of the present invention in a vacuum pre-compression state; Figure 8 This is a schematic diagram of the structure of the present invention, showing the bag expanding into a cup-shaped structure from the rear view. Figure 9 for Figure 8 A schematic diagram of the structure of the sac after it has expanded, viewed from the front. Figure 10 This is a schematic diagram of the adsorption membrane state when the capsule of the present invention is in a compressed state; Figure 11 for Figure 10 A schematic diagram of the adsorption membrane state after the capsule expands; Figure 12 This is a schematic diagram of the structure of the bladder of the present invention when it is compressed and extends into the digestive tract. Figure 13 for Figure 12 A top-view structural diagram; Figure 14 for Figure 12 A schematic diagram of the structure after the sac extends below the foreign object; Figure 15 for Figure 14 A top-view structural diagram; Figure 16 for Figure 14 A schematic diagram of a structure inflating a sac to capture a foreign object and then expelling it along with it; Figure 17 for Figure 16 A top-view structural diagram.

[0024] In the picture: 100 - Endoscope body; 101 - Operating section; 102 - Insertion section; 103 - Instrument insertion port; 104 - Connecting section; 200-Foot-operated positive and negative pressure device; 201-Foot-operated airbag; 202-One-way air inlet valve; 203-One-way air outlet valve; 204-Air supply pipe; 300-Liquid storage and pressure stabilizing device; 301-Tank body; 302-Flexible liquid storage bag; 303-Cover body; 304-Negative pressure interface; 305-Positive pressure interface; 306-Air inlet interface; 307-Liquid outlet of bag; 308-Filter layer; 309-Spike part; 310-End cap; 400 - Infusion tubing; 401 - Sealing film; 402 - Metal wire; 500 - Bag; 501 - Notch; 502 - Overflow hole; 503 - Adsorption membrane; 600 - Foreign object. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that in the description of this invention, the term "front end" refers to the direction closer to the foreign object when inserted into the body, and "rear end" refers to the direction closer to the operator.

[0027] like Figures 1 to 16 As shown, the present invention proposes an endoscope-based foreign body removal device for the digestive tract, which is used in conjunction with an endoscope body 100. The endoscope body 100 includes an operating part 101 and an insertion part 102. The operating part 101 is provided with an instrument insertion port 103, and the insertion part 102 is provided with an instrument channel (not shown).

[0028] This extraction device includes a foot-operated positive and negative pressure device 200, a liquid storage and pressure stabilizing device 300, an infusion tube 400, and a bag 500.

[0029] The foot-operated positive and negative pressure device 200 includes a foot pedal airbag 201, a one-way air inlet valve 202 and a one-way air outlet valve 203 disposed on the foot pedal airbag 201, and an air supply pipe 204 selectively connected to the one-way air inlet valve 202 and the one-way air outlet valve 203.

[0030] When the one-way air outlet valve 203 is connected to the air supply pipe 204, the foot pedal airbag 201 is pressed, the one-way air outlet valve 203 opens, and positive pressure airflow is generated and output through the air supply pipe 204, so that positive pressure is formed inside the liquid storage pressure stabilizing device 300; when the foot pedal airbag 201 is released, the one-way air inlet valve 202 opens, and external air enters the foot pedal airbag 201 to prepare for the next positive pressure output.

[0031] When the one-way air inlet valve 202 is connected to the air supply pipe 204, the foot pedal airbag 201 is stepped on, the one-way air outlet valve 203 opens, and the air inside the foot pedal airbag 201 is discharged. When the foot pedal airbag 201 is released, the one-way air inlet valve 202 opens, and the air in the liquid storage pressure stabilizing device 300 is drawn out into the foot pedal airbag 201, so that a negative pressure is formed inside the liquid storage pressure stabilizing device 300.

[0032] This design allows the operator to use both hands and feet simultaneously, freeing their hands to focus on endoscopic operations and improving surgical coordination and efficiency. It also enables switching between positive and negative pressure states within the fluid reservoir 300.

[0033] The liquid storage and pressure stabilizing device 300 includes a rigid tank and a flexible liquid storage bag 302 disposed inside the rigid tank. The rigid tank is composed of a tank body 301 and a cover 303 connected by threads; this detachable structure facilitates cleaning and component replacement. The cover 303 is provided with a negative pressure port 304 and a positive pressure port 305, both of which are tubular structures and threaded. An air inlet port 306 is provided at the end of the tank body 301 away from the cover 303, and this air inlet port 306 is connected to an air supply pipe 204. At least one side of the tank body 301 is a transparent plastic plate, and the flexible liquid storage bag 302 is also made of transparent material, facilitating observation of liquid level changes.

[0034] One end of the flexible liquid storage bag 302 is provided with a liquid outlet 307, which is threadedly connected to the positive pressure interface 305. The flexible liquid storage bag 302 stores liquid, preferably a medical lubricant, such as artificial saliva. The positive pressure interface 305 is provided with a filter layer 308, which uses a microporous filter membrane material to effectively block impurities and microorganisms, ensuring the sterility of the liquid.

[0035] The negative pressure interface 304 is a flexible tube with an L-shaped spike 309 on its inner wall. The tip of the spike 309 is flush with the end of the negative pressure interface 304, or the tip of the spike 309 extends more than 1 mm beyond the end of the negative pressure interface 304. Squeezing the negative pressure interface 304 causes the tip of the spike 309 to pierce the sealing film 401 of the infusion tube 400 connected to the negative pressure interface 304. End caps 310 are respectively provided at the ends of the negative pressure interface 304 and the positive pressure interface 305 to keep the interfaces clean and maintain the positive and negative pressure environments.

[0036] The infusion tubing 400 and the pouch 500 constitute the internal operating part of the device. The front end of the infusion tubing 400 communicates with the pouch 500, and the rear end is fitted with a sealing film 401. This sealing film maintains the infusion tubing 400 and the pouch 500 in a vacuum pre-compressed state (e.g., Figure 7 (As shown). This pre-compression significantly reduces the diameter of the entire assembly, facilitating the passage of the endoscope's instrument channel. Of course, this pre-compression can be prefabricated and encased in a disposable sterile packaging bag to ensure the sterility of the infusion tubing 400 and the bag 500.

[0037] A metal wire 402 is fixedly installed on the side wall of the infusion tube 400. This metal wire is a flexible metal wire, preferably a super-elastic nickel-titanium alloy. The metal wire 402 does not completely cover the entire length of the infusion tube 400; its length is only greater than the length of the insertion part 102. The front end of the metal wire 402 extends out of the infusion tube 400 and adheres to the side wall of the pouch 500, and the front end extends to be fixedly connected to the bottom of the pouch 500. This connection method ensures that the metal wire can effectively control the unfolding shape of the pouch, especially making it easier to guide the pouch 500 into the digestive tract to extend under the foreign object or through the gap between the foreign object and the digestive tract.

[0038] The 500 pouch is made of elastic medical-grade silicone material. When filled with liquid, it expands to form a cup-shaped structure (e.g., ...). Figure 8 , Figure 9 (As shown). The cup-shaped structure has a notch 501 at its opening and connected sidewalls. This asymmetrical design allows the pouch 500 to better accommodate irregularly shaped foreign objects, especially increasing the diameter of the pouch 500's receiving opening, making it easier for foreign objects to enter the cup-shaped structure. Multiple overflow holes 502 are spaced circumferentially along the outer wall of the cup-shaped structure. Each overflow hole 502 is covered with an adsorption membrane 503. The adsorption membrane 503 adheres only to the upper end of the pouch 500, forming a valve-like structure (e.g., ...). Figure 9 , Figure 10 (As shown). Since the pouch 500 is initially kept in a vacuum pre-compressed state, the adsorption membrane 503 can adhere well to the pouch 500 to seal the overflow hole 502. When the pouch 500 is filled with liquid, the negative pressure fails, and as the liquid fills the pouch 500, the excess liquid in the full pouch 500 eventually seeps out through the overflow hole 502. Due to the action of the liquid storage and pressure stabilizing device 300, the flexible liquid storage bag 302 is stably compressed, so the seepage from the overflow hole 502 is very stable and will not irritate the digestive tract.

[0039] This device is based on precise fluid control and mechanical support. The sac 500 forms a stable cup-shaped lifting structure through liquid inflation, utilizing its large contact area and adaptability to encapsulate foreign objects, fundamentally solving the problem of easy slippage when gripping foreign objects with traditional clamps.

[0040] The specific usage steps are as follows: Preoperative preparation, such as Figures 3-6 As shown: Unscrew the cap 303 and insert the flexible storage bag 302, pre-filled with sufficient medical lubricant, into the tank 301. Thread the bag outlet 307 to one end of the positive pressure port 305. The other end of the positive pressure port 305 is connected to an end cap 310. The negative pressure port 304 is also connected to an end cap 310. Tighten the tank 301 and cap 303 to ensure a good seal. Connect the air supply pipe 204 through the air inlet port 306. The air supply pipe 204 is connected to the one-way air inlet valve 202.

[0041] Device introduction, such as Figure 12 , Figure 13 As shown: The infusion tube 400 with the pouch 500 is inserted into the instrument insertion port 103 of the endoscope operating section 101 and slowly advanced through the instrument channel of the insertion section 102. The wire 402 provides the necessary support rigidity, while its flexibility allows it to pass smoothly through the curved instrument channel. Under the guidance of the endoscope, the insertion section 102, along with the pouch 500 and the infusion tube 400, enters the digestive tract. The foot-operated airbag 201 maintains a negative pressure state inside the container 301. When approaching the foreign object 600, the end cap 310 of the negative pressure port 304 is removed, and the rear end of the infusion tube 400 is connected to the negative pressure port 304. During this process, the negative pressure interface 304 is squeezed and bent, causing the L-shaped spike 309 to pierce the sealing film 401. Simultaneously, the foot pedal airbag 201 is continuously stepped on, maintaining a negative pressure state inside the tank 301. Because the negative pressure interface 304 is connected to the negative pressure environment of the liquid storage and pressure stabilizing device 300, the bag 500 remains compressed or only slightly deformed. Under endoscopic guidance, the compressed bag 500 is then pushed under the foreign object 600. Figure 14 , Figure 15 As shown.

[0042] Foreign object capture: Connect the gas supply pipe 204 to the one-way vent valve 203. During this process, the negative pressure inside the tank 301 is released, and the bladder 500 begins to slowly inflate. Switch the connection interface of the infusion pipe 400 to connect it to the positive pressure interface 305, and seal the negative pressure interface 304 using the end cap 310. The operator continuously pedals the foot pedal airbag 201, and the positive pressure airflow enters the rigid tank through the gas supply pipe 204, compressing the flexible liquid storage bag 302. Under stable pressure, the lubricant enters the bladder 500 through the positive pressure interface 305 and the infusion pipe 400.

[0043] The pouch 500 gradually expands to form a cup-shaped structure, and the metal wire is slightly pulled back to lift and partially enclose the foreign object 600. The design of the notch 501 allows the pouch 500 to adapt to the irregular shape of the foreign object, avoiding pressure concentration caused by complete closure.

[0044] Once the bladder 500 is fully inflated, continued positive pressure causes the adsorption membrane 503 to open, allowing lubricant to seep out through the overflow hole 502. The pressure applied by the foot pedal airbag 201 controls the lubricant release rate, and the adsorption membrane 503 inhibits the lubricant overflow angle, ensuring the formation of a uniform lubricating layer between the bladder 500 and the digestive tract wall.

[0045] Foreign object removal, such as Figure 16 , Figure 17 As shown: While maintaining the inflated state of the bladder 500, slowly withdraw the endoscope insertion section 102. The bladder 500 lifts the foreign object 600 during withdrawal, and the cup-shaped structure provides a support surface that effectively prevents the foreign object from slipping during withdrawal. Lubricant continuously seeps out through the overflow hole 502, reducing frictional resistance during removal. Once the device is completely withdrawn, release the foot pedal airbag 201, and the bladder 500 retracts under its own elasticity, allowing for easy removal of the foreign object.

[0046] The cup-shaped structure of the pouch 500 of this invention provides stable mechanical support. Its large contact area and adaptable encapsulation significantly improve the reliability of foreign body fixation, making it particularly suitable for removing smooth-surfaced foreign bodies such as button batteries. The foot-operated positive and negative pressure device 200, in conjunction with the liquid storage and pressure stabilizing device 300, enables precise control of the pouch expansion process. The stable pressure environment provided by the rigid container ensures smooth liquid flow and avoids tissue damage caused by sudden pressure changes. The foot pedal operation frees the doctor's hands, allowing them to focus on operating the endoscope. The flexible design of the metal wire 402 ensures both passability and provides the necessary support rigidity. The lubricant release mechanism controlled by the adsorption membrane 503 ensures lubrication effectiveness while avoiding the risks associated with excessive lubricant. The silicone material of the pouch 500 and the medical lubricant have good biocompatibility, minimizing tissue irritation.

[0047] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An endoscope-based device for removing foreign bodies from the digestive tract, characterized in that, include: A foot-operated positive and negative pressure device, a liquid storage and pressure stabilizing device, an infusion tube, and a bag; the foot-operated positive and negative pressure device includes a foot pedal airbag, a one-way inlet valve and a one-way outlet valve disposed on the foot pedal airbag, and an air supply tube communicating with the one-way inlet valve or the one-way outlet valve; the liquid storage and pressure stabilizing device includes a rigid tank and a flexible liquid storage bag disposed inside the rigid tank; one end of the rigid tank is connected to the air supply tube, and the other end is provided with a negative pressure interface and a positive pressure interface; one end of the flexible liquid storage bag is provided with a bag outlet, which is connected to the positive pressure interface; the flexible liquid storage bag stores liquid; the negative pressure interface and the positive pressure interface... Each end of the infusion tube is provided with an end cap; the front end of the infusion tube is connected to the bladder bag, and the rear end of the infusion tube is provided with a sealing film to maintain the infusion bag and the bladder bag as a whole in a vacuum pre-compressed state; the rear end of the infusion tube is adapted to the negative pressure interface and the positive pressure interface; a metal wire is fixedly provided on the side wall of the infusion tube, and the front end of the metal wire extends out of the infusion tube and connects to the side wall of the bladder bag; the infusion tube with the metal wire and the bladder bag in a vacuum pre-compressed state are configured to allow the infusion tube to pass through the instrument insertion port of the endoscope's operating part into the instrument channel of the insertion part and to extend out from the front end of the insertion part.

2. The endoscopic foreign body removal device for the digestive tract according to claim 1, characterized in that, The internal space of the sac is filled with liquid and expands to form a cup-shaped structure; the cup-shaped structure has a notch at the mouth and the adjacent sidewall.

3. The endoscopic foreign body removal device for the digestive tract according to claim 2, characterized in that, The liquid stored in the flexible storage bag is a lubricant; the outer wall of the cup-shaped structure is provided with a plurality of overflow holes spaced apart along the circumference; the outer wall of each overflow hole is covered with an adsorption film, and the adsorption film is only adhered to the bag at its upper end.

4. The endoscopic foreign body removal device for the digestive tract according to claim 2, characterized in that, The portion of the metal wire extending out of the infusion tube is adhered to the side wall of the cup-shaped structure, and the front end of the metal wire extends to be fixedly connected to the bottom of the cup-shaped structure.

5. The endoscopic foreign body removal device for the digestive tract according to claim 1, characterized in that, The rigid tank includes a tank body and a cover connected by threads; the cover is provided with a negative pressure interface and a positive pressure interface; both the negative pressure interface and the positive pressure interface are tubular structures and are equipped with threaded structures; the outlet of the flexible liquid storage bag is threadedly connected to the positive pressure interface; the rear end of the infusion tank is equipped with a threaded structure.

6. The endoscopic foreign body removal device for the digestive tract according to claim 5, characterized in that, The negative pressure interface is a flexible tube with an L-shaped spike on its inner wall. The tip of the spike is flush with the end of the negative pressure interface and is used to puncture the sealing film.

7. The endoscopic foreign body removal device for the digestive tract according to claim 5, characterized in that, The positive pressure interface has a filter layer inside.

8. The endoscopic foreign body removal device for the digestive tract according to claim 5, characterized in that, An air inlet is provided at the end of the tank away from the cover, and the air inlet is connected to the air supply pipe.

9. The endoscopic foreign body removal device for the digestive tract according to claim 5, characterized in that, At least one side of the tank is a transparent plastic plate, and the flexible liquid storage bag is a transparent bag.

10. The endoscopic foreign body removal device for the digestive tract according to claim 1, characterized in that, The metal wire is a flexible metal wire.

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