30 results about "Gastric Content" patented technology

The application relates to the field of medical masks, in particular to a mask with a gastrointestinal mirror channel, which comprises a mask main body, an oxygen supply assembly, a gastrointestinal mirror channel assembly, an anti-aspiration assembly and a sealing adjustment assembly. The oxygen supply assembly provides clean and controllable breathing support through a multi-layer filter membrane and a flow adjustment function; the gastrointestinal mirror channel assembly is designed with a flexible sealing sleeve and an elastic support strip, thereby ensuring air tightness and adaptability during gastrointestinal mirror operation; the anti-aspiration assembly effectively deals with vomiting reflex or gastric content reflux through an arc-shaped baffle and a drainage groove; and the sealing adjustment assembly improves the adhesion and stability of the mask by using an air bag. The application can simultaneously realize breathing support and gastrointestinal mirror operation, and takes into account the safety and comfort of patients, thereby providing a perfect solution for digestive endoscopy.

Esophageal intubation assemblies, esophageal cardiac stimulation and gastric decompression assemblies, and methods for using and making the same are provided.

A system for a bypass-like, transduodenal passage of stomach contents, comprising: a transduodenal bypass unit (BE), itself comprising a transduodenal assembly (TDG) having a tubular film (7) for the passage of stomach contents into the jejunum, and also comprising a transpyloric assembly (TPG) having a hose-like or tubular shaft component (2); a transesophageal positioning unit (PE) having a tubular shaft component (9), the outer diameter of said shaft component being smaller, at least in a distal region, than the inner diameter of the shaft component (2); and an extracorporeally controllable coupling device (KE) which selectively fixates the shaft component (2) to the shaft component (9) for coupling purposes or releases the same for decoupling purposes.

The invention discloses a composite solution for treating reflux esophagitis and a preparation method and application thereof, and relates to the technical field of pharmaceutical preparations, the composite solution is formed by physically mixing drug-loaded microspheres and a gastric buoyant raft matrix solution; wherein the drug-loaded microspheres are solid particles which take thiolated pectin as a carrier, are crosslinked and cured through divalent metal ions and are coated with a periplaneta americana extract; the gastric buoyant raft matrix solution comprises a hydrophilic colloid, a component capable of generating gas when encountering acid and a stabilizer. The magnesium mercapto pectin microspheres provide excellent mucous membrane adhesion, and the acting time of the medicine on the esophageal focus is prolonged; the gastric buoyant raft substrate forms a physical barrier in a gastric acid environment to inhibit regurgitation of gastric contents. Through cooperation of the two, a dual treatment mechanism of local repair and source control is realized. The preparation can remarkably prolong the in-vivo residence time and effectively promote esophageal mucosa healing, and the curative effect is better than that of a pure periplaneta americana extract preparation.

To provide a gastrostomy catheter capable of more surely regulating the backflow of a nutrient or gastric contents from the inside of the stomach to the outside of the body.SOLUTION: The gastrostomy catheter 100 comprises a shaft 10 having a lumen 11, and a check-valve 40, wherein the check-valve 40 has a base part 41, a downward projecting part 51, and an annular 51a part 43, the shaft 10 has a body surface contact part 20 and an annular rib 23, the gap between the annular wall part 43 and the downward projecting part 51 constitutes an annular groove 44 into which the annular rib 23 fits, and a valve opening 45 is formed in the side wall of the lower end of the downward projecting part 51. A lower portion of the downward projecting portion 51 serves as a press-fitting portion 53, the press-fitting portion 53 has a large-diameter portion 54 whose size in the first direction is larger than the inside diameter of the lumen 11, and the size of the downward projecting portion 51 in the first direction gradually increases downward at a boundary portion 54a between the upper portion 52 of the downward projecting portion 51 and the large-diameter portion 54.SELECTED DRAWING: Figure 2

The invention relates to the technical field of feeds, in particular to a dietary dog food for recuperating gastrointestinal tracts of dogs and a preparation method thereof, and the dietary dog food comprises a basic nutritional agent, a gastric regurgitation preventing agent, a magnesium-zinc absorption promoting agent and a preservative. The modified sodium alginate forms gel in the stomach of the dog, sodium bicarbonate is decomposed to generate carbon dioxide gas to push the gel to float upwards to the cardia to form a shielding layer, and the modified cellulose releases calcium ions to promote crosslinking of the modified sodium alginate to form a more compact shielding layer so as to prevent backflow of contents in the stomach of the short-nose dog after the short-nose dog eats. The active form of vitamin D3 is combined with a vitamin D receptor in intestinal epithelial cells, gene expression of channels and ion transporters is up-regulated, and the absorption effect of dogs on magnesium and zinc in a high-calcium environment is promoted. The fructo-oligosaccharide enhances the signal transduction efficiency of the vitamin D3 by up-regulating the expression level of a vitamin D receptor, and further enhances the promotion effect of the vitamin D3 on magnesium and zinc absorption.

The utility model belongs to the technical field of medical instruments, and particularly relates to a guide wire assembly which comprises a guide wire fixing seat, and a liquid channel is formed in the middle of the guide wire fixing seat. A pressing block and a plurality of supporting columns which are matched with each other are arranged in the liquid channel; the supporting column is arranged on the inner wall of the liquid channel; the pressing block is arranged on the supporting column; and the guide wire is arranged in the pressing block. The liquid channel is formed in the guide wire fixing seat, and the guide wire is limited in the liquid channel through mutual matching of the supporting column and the pressing block; therefore, the work of confirming whether the nasogastric tube is successfully inserted into the stomach or not and the operations of sucking gastric juice and gastric contents and inflating can be completed under the condition that the guide wire is not detached; the potential safety hazard caused by the fact that the guide wire is fed after being detached is avoided, and meanwhile the efficiency of medical workers is improved.

The utility model discloses an auxiliary treatment mattress for reflux esophagitis, and relates to the technical field of medical auxiliary instruments. The auxiliary treatment mattress for reflux esophagitis comprises a mattress body and an air pump, a self-adaptive bending groove is formed in the outer wall of the bottom of the mattress body, a protection pad is arranged on the upper portion of the mattress body, an angle adjusting air bag is arranged at the bottom of the mattress body, a connecting belt is fixedly connected to the outer wall of the angle adjusting air bag, and the connecting belt is fixedly connected to the outer wall of the angle adjusting air bag. The connecting belt is arranged on the outer side of the angle adjusting air bag in a surrounding mode, a first hidden buckle is fixedly connected to the inner side of the connecting belt, a second hidden buckle is fixedly connected to the outer wall of the mattress, and the first hidden buckle and the second hidden buckle are connected in a clamped mode. The angle adjusting air bag is inflated through the air pump, so that the mattress forms an inclined plane, the chest and the back of a patient are raised, the probability that gastric contents flow back to the esophagus is reduced through gravity, the sleep position suggestion of the reflux esophagitis patient is met, symptoms caused by gastric acid reflux at night of the patient can be effectively relieved, and the treatment effect is improved.

This invention discloses an auxiliary medication feeding device for intensive care, relating to the field of medical device technology. It includes a transfer assembly with an input interface and an input cavity communicating with the input interface; a tubing assembly comprising a coaxially sleeved and relatively slidable outer tube and inner tube; and an expansion assembly located in the middle section of the outer tube, including a limiting membrane and an expansion flap, the limiting membrane and expansion flap being inclined in opposite directions and both pointing towards the cardia. The transfer assembly of this auxiliary medication feeding device for intensive care incorporates a slidable piston and an elastic element, forming a mechanical pressure feedback valve that effectively prevents reflux and patient discomfort caused by sudden pressure increases. Furthermore, the expansion flap design allows it to closely conform to the cardia area, forming a physical sealing barrier. This effectively blocks the reflux of gastric contents, significantly reducing the risk of aspiration pneumonia.

The invention relates to the technical field of valves, in particular to a gastroesophageal valve and a treatment device.The gastroesophageal valve comprises a valve membrane body, an extension edge and a presser foot edge, and the extension edge is a shape memory reset piece; the valve membrane body which is restored to a normal structure is used for preventing backflow of gastric contents, the presser foot edge is sewn to the esophagus or cardia, the valve membrane body can turn over towards the stomach body along with pushing of food chyme in the digestive tract, the valve membrane body can be bent and deformed when the space of the gastroesophagus is reduced, the shape is reset when the space of the gastroesophagus is restored, and therefore the gastroesophagus can be recovered. Therefore, the oesophagus and the fundus of stomach do not need to be folded, only the valve for shielding regurgitation of the contents in the stomach is added, the normal physiological anatomical structure of the oesophagus and the fundus of stomach is almost unchanged, the valve is simply sutured by the flexible medical suture line, the injury range is small, and the injury amplitude is small. The device is simple in structure, low in manufacturing cost, easy to install, few in operation steps, free of ultrasonic guidance, hard anastomat and hard fasteners, and convenient to disassemble and replace.

The invention discloses an anti-reflux stomach tube, which relates to the technical field of medical instruments and comprises a tube body and a connector connected with one end of the tube body. The head end is installed at the other end, away from the connector, of the pipe body, the top end of the head end is spherically closed, and a side hole is formed in the side wall; the air bag assembly sleeves the outer side of the tube body, and one end of the air bag assembly is fixedly connected with the tube body; the air bag assembly is folded towards the center, and the outer surface of the air bag assembly is tightly attached to the inner wall of the stomach tube. The device has the beneficial effects that micro gaps around the tube are actively blocked through radial expansion of the air bag assembly, and a reflux path of gastric contents is effectively blocked; operation is easy and convenient and can be completed through single-hand stretching; the supporting part shrinks and punctures the inner wall when being taken out, the tip is wrapped by wrinkles after gas is exhausted, esophageal mucosa injury is avoided, and clinical safety and use convenience are remarkably improved.

The present application belongs to the field of food technology, and relates to a satiety composition for obesity intervention and application thereof. The satiety composition provided by the present application is composed of erythritol, alginate, pectin and resistant dextrin. The satiety composition provided by the present application can quickly absorb water in the stomach to form a gel, increase the volume and elasticity of the stomach contents, prolong the flow time of nutrients, and achieve a satiety feeling of more than 3 hours. The satiety composition slowly dissolves in the small intestine in the intestinal tract to form macromolecular polysaccharides and dietary fibers, and promote intestinal peristalsis. The satiety composition can be dissolved in water, and can be used to make different dosage forms or foods, and has a wide range of applications.

According to the valve and the valve fixing device, the esophagus and the fundus of stomach do not need to be folded, only one auxiliary valve for shielding regurgitation of contents in the stomach is added, the normal physiological anatomical structure of the esophagus and the fundus of stomach does not change, the fixation is realized by simply suturing soft medical sutures, and the problem of regurgitation of food is solved; an operation performed through the device and the valve has a small tissue damage range and small damage amplitude, and in addition, the device and the valve are simple in structure, low in manufacturing cost, easy to install and few in operation steps; in the operation process, ultrasonic guidance is not needed, a hard anastomat is not needed, and detachment or / and replacement of valve separation are / is facilitated in the future.

The invention discloses an esophagus plugging type stomach tube structure with a function of preventing regurgitation and aspiration, which comprises a stomach tube body capable of preventing regurgitation and aspiration, wherein the stomach tube body is inserted into the stomach of a patient through a nostril and an esophagus when a medical worker performs related operation on the patient and can prevent regurgitation and aspiration of stomach contents; the front end of the stomach tube body is arranged in the stomach of a patient, and the tail end of the stomach tube body is arranged on the outer side of the nose of the patient. The stomach tube fixing structure can effectively fix the tail end of the stomach tube body to the upper lip of a patient, and the stomach tube fixing structure is arranged at the upper lip of the patient. According to the stomach tube capable of preventing regurgitation and aspiration, regurgitation and aspiration can be prevented through the stomach tube body capable of preventing regurgitation and aspiration, the tail end of the stomach tube body capable of preventing regurgitation and aspiration can be effectively fixed to the upper lip of a patient through the stomach tube fixing structure, and the stomach tube is not prone to falling off from the nose of the patient; meanwhile, allergy and infection of the skin of the patient can be effectively avoided, and great comfort is brought to the patient.

The invention provides a dynamic closed-loop control method of a nasal feeding pump and an intelligent nasal feeding system, and is applied to the technical field of medical instruments and control. The method comprises the following steps: acquiring a nasal feeding tube end pH value, complex impedance and ultrasonic data, comparing the pH value data with a gastric acid pH threshold interval and comparing a complex impedance data modulus value characteristic with a biological tissue impedance interval, generating a position signal, calculating a liquid level height based on the ultrasonic data, mapping the liquid level height into a gastric retention amount estimation value, and calculating a gastric retention amount estimation value. Generating an infusion pump motor driving control instruction according to the gastric retention and the position signal; according to the scheme, the position of the pipeline and the residual quantity of gastric contents can be monitored in real time, infusion is dynamically adjusted accordingly, and the risk of aspiration by mistake is reduced.

The present application provides a kind of gastric laparoscopic surgery puncture device with anti-skid fixing function, overcome the traditional puncture device cannot be punctured into stomach cavity, stomach cavity cannot be close to abdominal wall after puncture, gastric contents easily reflux into abdominal cavity through puncture device and cause pollution etc. Surgical difficulties, this puncture device makes this new technology surgical procedure more simplified, safe and effective. Including sleeve assembly and puncture assembly, sleeve assembly includes sleeve seat and sleeve arranged at one end of sleeve seat, puncture assembly includes puncture handle and puncture needle arranged at one end of puncture handle, and puncture needle is slidably arranged in sleeve. The present application can effectively avoid the phenomenon that sleeve slides out from stomach cavity, repeatedly punctures and damages stomach and other organs and blood vessels of patient, avoid pulling out the whole puncture device when pulling out the equipment, ensure that gastric laparoscopic surgery is carried out smoothly, reduce the pain of patient;Simple structure, convenient operation, save time and effort, improve the protection and fixing effect of sleeve and surgical efficiency;Can pull the skin incision, improve the fixing effect.

The invention provides an estuary juvenile fish habitat quality evaluation method, which comprises the following steps: S11, collecting juvenile fish samples, simultaneously collecting environment data preferred by the juvenile fish samples, and processing the environment data to obtain an environment factor adaptation threshold value and the requirements of juvenile fishes on habitat characteristics; s12, extracting the gastric content of the juvenile fish sample, determining the gastric content, determining the composition of the gastric content, and further deducing the feeding habitat of the juvenile fish; s13, extracting and analyzing otolith of the juvenile fish sample, and determining a migration path recording matrix of juvenile fish structuring; s14, calculating an ecological adaptability index of the juvenile fish in the single habitat according to the environmental factor adaptation threshold value of the juvenile fish sample, the habitat characteristic demand of the juvenile fish, the composition of the stomach content of the juvenile fish and the structured migration path recording matrix of the juvenile fish; and S15, calculating the final ecological adaptability value of the corresponding habitat according to the ecological adaptability index values of all juvenile fishes in the single habitat. According to the invention, the accuracy of key juvenile rearing habitat identification and the precision of ecological management are significantly improved.

This invention discloses an anti-reflux gastric tube, relating to the field of medical device technology. It includes a tube body, a connector connected to one end of the tube body, a tip located at the end furthest from the tube body and connector, with a spherical closed tip and side holes on its sidewalls, and a balloon assembly fitted onto the outside of the tube body, with one end fixedly connected to the tube body. The balloon assembly converges towards the center, its outer surface tightly adhering to the inner wall of the gastric tube. The advantages of this invention are: the radial expansion of the balloon assembly actively seals the micro-gaps around the tube, effectively blocking the reflux path of gastric contents; it is easy to operate, requiring only one hand to pull; during removal, the support portion contracts and punctures the inner wall, and after the gas is expelled, the folds wrap around the tip, avoiding damage to the esophageal mucosa, significantly improving clinical safety and ease of use.

The utility model discloses a ruminant rumen content collecting device. The ruminant rumen content collecting device comprises a guide pipe; a rumen content inlet cavity and a rumen content collecting cavity are formed in the sampling pipe, one end of the rumen content inlet cavity is communicated with one end of the guide pipe, the other end of the rumen content inlet cavity is communicated with one end of the rumen content collecting cavity, and a rumen content inlet communicated with the rumen content inlet cavity is formed in the outer pipe wall of the sampling pipe; the guide wire extends into the catheter, the rumen content enters the cavity, and a push plug used for pushing the rumen content in the rumen content entering cavity to the rumen content collecting cavity is fixed at the end of the guide wire. According to the device, only one-time intubation operation is needed, the rumen contents are pushed to the rumen content collecting cavity by repeatedly drawing and pushing the guide wire, the rumen contents do not need to be drawn out through a catheter through traditional negative pressure suction, and the problem that due to the fact that the rumen contents flow out through the catheter, the catheter is prone to being blocked, and oedema is caused by repeated intubation stimulation of the esophagus is solved.

A method and apparatus for determining gastric content volume. The internal temperature of the contents of the stomach is measured at least one predetermined time t after the patient is fed, and the gastric volume determined from the temperature. In preferred embodiments, a known volume of water at a known temperature is injected into the stomach, and the temperature of the stomach contents is measured after the stomach temperature has stabilized. An apparatus for performing the method, in which continuous measurement is possible without disturbing the patient's feeding schedule, and a method for using the inventive method in the control of an automatic feeding apparatus, are also disclosed.

The invention provides a staged adaptive integrated giant panda life cycle weight prediction method and system, and relates to the technical field of big data mining, and the method comprises the steps: obtaining original data; carrying out digestion cycle dynamic modeling according to the original data, and obtaining a real-time gastric content mass estimation value by constructing a time-varying differential equation with gastric emptying dynamic characteristics; according to the real-time gastric content mass estimation value, carrying out fasting weight inversion to obtain a basic fasting weight sequence; performing growth stage adaptive division according to the basic empty stomach body weight sequence to obtain a stage standardized growth baseline; performing multi-model integrated prediction according to the stage standardized growth base line to obtain a weight prediction value; and life cycle uncertainty quantification is carried out according to the weight prediction value, and a life cycle weight prediction pedigree is generated. According to the method, the long-standing problems of poor stage adaptability, large data noise interference and high prediction uncertainty in panda weight prediction are solved.

This invention relates to the field of medical device technology and discloses a multifunctional gastrointestinal decompression device integrating negative pressure drainage and enteral nutrition monitoring. The device includes a liquid collection tube and a storage tank. In this invention, multiple sets of liquid inlet grooves are evenly distributed on the end tube wall, coupled with an inlet filter, to block large pieces of gastric contents, reducing the risk of tube blockage from the source. The liquid inlet grooves are equipped with a dedicated backflushing component, which automatically cleans the filter when it becomes clogged. The beveled end face design of the end tube pushes blockages from the filter surface into the tube, where internal cutting blades break up clumps of gastric contents, which are then finely ground by a grinding disc to reduce the volume of contents. This device integrates filtration, anti-clogging, backflushing, breaking up, and grinding functions, improving the safety and efficiency of clinical use. Simultaneously, the connection structure between the gastric contents storage tank and the liquid collection tube is optimized, abandoning cumbersome connection methods and adopting a convenient sealing structure, allowing for quick and easy manual disassembly and assembly of the liquid collection tube, shortening operation time and meeting the needs of efficient clinical diagnosis and monitoring.

This invention relates to the field of medical device technology. It comprises a housing, a connecting tube, a limiting mechanism, and a gastric tube fixing mechanism. Limiting mechanisms are fixed on both the front and rear sides of one outer wall of the housing. A connecting tube is inserted into the other side wall of the housing, and the gastric tube fixing mechanism is fitted onto the outer end of the connecting tube. A flow control valve is installed on the connecting tube and located inside the housing. A pump is fixed on the inner wall of one side of the housing. The outlet of the pump is connected to the connecting tube, and an inlet pipe is connected to the inlet of the pump. This invention facilitates the fixing of the gastric tube while controlling the injection speed, preventing a sudden increase in the infant's gastric contents and avoiding gastrointestinal dysfunction, thus reducing the occurrence of abdominal distension, vomiting, and other complications. This invention has the advantages of reasonable design and low manufacturing cost.

The invention relates to an anti-backflow portable enteral nutrition feeding device, and belongs to the technical field of feeding appliances. Comprising a container assembly, the container assembly comprises a rigid shell and a flexible inner container installed in the rigid shell, and the flexible inner container is provided with a cavity used for containing a nutrient solution; the upper cover assembly is connected to the top of the container assembly in a sealed mode, and the upper cover assembly is provided with a liquid outlet connector communicated with the cavity of the flexible inner container; the air bag propelling system comprises an inflatable air bag and a pneumatic control module; the pneumatic control module is arranged at the bottom of the container assembly, and the expandable air bag is arranged between the outer wall of the bottom of the flexible inner container and the rigid shell. And the backflow of external liquid or stomach contents is effectively prevented.

The invention discloses a device and a method for identifying tissue damage caused by catheter bending of a stroke patient. The device comprises an image acquisition unit, a distance detection assembly and a processor. The processor is configured as follows: when the near-end displacement of the catheter is not changed and the far-end displacement is within a preset range, triggering to collect a far-end image and comparing the far-end image with a standard image; if the coincidence rate is greater than a threshold value and abnormal gastric contents (such as bleeding) are identified, it is determined that catheter bending has caused esophagus or stomach injury. According to the invention, the damage caused by catheter bending can be automatically and timely identified, an accurate emergency intervention basis is provided for medical personnel, and the problem that the damage of the inner cavity tissue is difficult to directly judge in the existing monitoring technology is solved.

The utility model provides a stomach residue sampler which comprises a sampling tube and is characterized in that a sampling mechanism is movably arranged in the sampling tube and is connected with a driving component, an air bag is sleeved on the sampling tube, and the air bag is connected with external air supply equipment through a hose. The driving assembly drives the sampling mechanism to stretch out of the sampling tube to sample residues in the stomach, after sampling is completed, the driving assembly drives the sampling mechanism to retract into the sampling tube, so that it is ensured that a sample cannot be polluted, after the sampling tube is inserted into the digestive tract, the sampling tube can be fixed in the digestive tract through the expansion air bag, reflux of gastric contents is effectively prevented, and the sampling efficiency is improved. And the esophagus of a sampled person is prevented from being burnt or the sampling work is prevented from being interfered.

The present application relates to the medical field, and specifically discloses a gastric content model training method, medium, device and application thereof. The present application aims to solve the problem of inaccurate prediction of the existing gastric content model, and specifically provides a gastric content model with higher accuracy, a training method, medium, device and application thereof.

The invention discloses a visual stomach tube guiding and supporting device. Comprising a holding control mechanism, a visual guiding and supporting mechanism, a drawing protection mechanism and a soft rubber oral cavity fixing mechanism, and the holding control mechanism is used for being connected with and controlling an image obtaining mechanism to work and being connected with expansion equipment; the visual guiding and supporting mechanism is used for guiding and supporting the image acquisition mechanism to enter the gastrointestinal space and flushing the gastrointestinal space and reflowing and discharging gastric contents and gas in the stomach; and the drawing protection mechanism is used for isolating and protecting the drawing visual guide supporting mechanism from being polluted. The visual stomach tube guiding and supporting device has the beneficial effects that the visual stomach tube guiding and supporting device which is formed by combining the newly designed holding control mechanism, visual guiding and supporting mechanism, drawing protection mechanism and soft rubber oral cavity fixing mechanism and has multiple functions and higher efficiency meets various requirements for onlooks in existing operation application, and the safety is higher; and the operation reliability is better.

The anti-reflux enteral nutrition infusion pipeline comprises a double-cavity catheter, a plurality of Luer tapers are arranged at the tail end of the double-cavity catheter, a nose fixing fin is arranged on the outer side of the double-cavity catheter, the double-cavity catheter is provided with an anti-reflux mechanism at the junction of the stomach bottom and the upper section of the stomach body, and the double-cavity catheter comprises an outer tube and an inner tube. A one-way valve is arranged between the end of the outer pipe and the end of the inner pipe, the direction is set to enable the inner pipe to flow to the outer pipe, the anti-backflow mechanism comprises a driving part, a feedback part, an early warning part, an outer sealing part and an inner blocking part, the feedback part comprises a gas storage ring fixedly connected to the outer side of the double-cavity catheter, and a movable channel is formed between the gas storage ring and the outer pipe; and an isolating ring is fixedly connected into the movable channel. According to the invention, the beneficial effects of double-path anti-reflux plugging and real-time visual early warning when the intragastric pressure is abnormal are realized, the risk of reflux aspiration of gastric contents is effectively avoided, then the reflux path is bidirectionally blocked, and the clinical safety of enteral nutrition infusion is improved.

The utility model relates to the field of medical equipment, and discloses an anti-aspiration gastroscope tube, which comprises a gastroscope body, a flow choking piece, an air bag and an inflation tube, the flow choking piece is arranged on the gastroscope body, an annular side wall is formed by cutting along the circumferential direction of the side wall of the flow choking piece, and the air bag is arranged on the annular side wall and is used for abutting against the esophagus; the air bag is arranged on the gastroscope body, the inflation tube is arranged on the gastroscope body and connected with the air bag, a closed air nozzle is arranged on the inflation tube, and the inflation tube is used for being connected with a suction device. The flow blocking piece is arranged on the gastroscope body, the side wall of the flow blocking piece is cut in the circumferential direction to form the annular side wall, the annular side wall is connected with the air bag, the air bag is connected with the inflation tube, a suction device is inserted into the inflation tube to inflate the air bag, and the expanded air bag makes contact with the esophageal wall of a patient. The backflow of the gastric substances is prevented through the joint cooperation of the flow blocking piece and the air bag, and the patient is prevented from aspirating the gastric substances by mistake.