A nasogastric flushable catheter device and its method of care

Abstract

This invention discloses a nasogastric feeding tube device with backflushing capability. It includes a feeding tube body with a feeding channel, a flushing channel, and a filling channel running through its interior. A feeding head is located at the front end of the feeding tube body. The feeding head has an insertion hole that seals with the front end of the feeding tube body. A food outlet is located on the side of the feeding head, and the bottom of the food outlet is recessed to form a groove communicating with the insertion hole. An expansion bladder is located within the groove, which can form a closed cavity communicating with the front end of the filling channel. The expansion bladder can be inflated to block the insertion hole and the food outlet. The front end of the flushing channel opens into the insertion hole and communicates with the front end opening of the feeding channel. Fluid is injected into the expansion bladder, causing it to inflate and block the food outlet from the insertion hole, creating a connected, independent space between the feeding channel and the flushing channel. Flushing fluid is injected through the flushing channel to flush the feeding channel, preventing food residue from adhering and thus extending the service life of a single nasogastric feeding tube.

Description

Technical Field

[0001] This invention relates to intestinal tube feeding technology, and more particularly to a nasogastric feeding backflushable catheter device and its maintenance method. Background Technology

[0002] A nasogastric tube is a type of intestinal feeding tube inserted into the intestines through the nostril. Liquid nutrition is then administered through the tube to provide the body with necessary nutrients. Typically, after administering liquid nutrition through a gastric tube, a small amount of drinking water is added to flush the inner wall of the tube. However, this process cannot be repeated with intestinal tubes, resulting in food residue adhering to the inner wall. This residue can solidify, clump, and cause blockages, or it can putrefy and breed bacteria, leading to a short lifespan for a single nasogastric tube and requiring frequent replacement.

[0003] Chinese utility model patent CN202021227648, "A Bionic Nasointestinal Tube," discloses a feeding tube that uses a pull ring to move a thin filament, causing a U-shaped tongue-like feature to move inwards, and then returns to its original position under the action of a return spring. The patent claims that repeating this action several times can clear deposited protein or food. However, this structure requires pulling the thin filament to return the U-shaped tongue, and the tongue's restoring force is difficult to achieve. Furthermore, the filament needs to bend and deform to lengthen when the tongue swings inwards, and the pulling action shortens the filament inside the tube, which is theoretically impossible. Also, the accumulation of protein or other food is not necessarily at the U-shaped incision. Therefore, this technical solution cannot solve the problem of food residue adhesion and extend the product's shelf life.

[0004] Chinese invention patent application CN114795963A, titled "A Multifunctional Self-Flushing Constant Temperature Enteral Nutrition Nasogastric Tube," describes a nasogastric tube technology that can flush out blockages. The technology involves detecting whether there are blockages inside the tube and then flushing in the same direction. The flushing fluid flows into the gastrointestinal tract. However, a large amount of flushing fluid can cause gastrointestinal discomfort, and the equipment structure for implementing this solution is relatively complex.

[0005] Chinese invention patent application CN111973829A, titled "A Bidirectional Pressure Gastric Lavage Device for Gastroenterology," describes a gastric lavage device that uses a cannula for injection and aspiration. Fluid is introduced between the outer and inner tubes for lavage, and then aspirated through the inner tube. If the inner tube becomes blocked, it can be flushed in reverse to clear the blockage. However, impurities and flushing fluid generated during this reverse flushing process fall into the stomach, increasing the burden on the stomach and preventing the device from independently completing its self-cleaning process. Furthermore, devices inserted into the intestine to administer nutrient solutions already contain very small amounts of nutrient solution, making it even more inappropriate to allow the lavage fluid to flow into the intestine after lavage. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a nasogastric backflushable catheter device that can improve the service life of a single nasogastric tube and extend its lifespan, and provides a maintenance method for the nasogastric backflushable catheter device.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a nasogastric feeding backwashable catheter device, which includes a feeding tube body, a feeding channel, a flushing channel, and a filling channel that are internally connected to the feeding tube body. A feeding head is fixedly sleeved at the front end of the feeding tube body. The rear end of the feeding head is provided with an insertion hole that is sealed and sleeved with the front end of the feeding tube body. One side of the feeding head is provided with a food outlet. The bottom of the food outlet is recessed to form a groove that communicates with the insertion hole. An expansion bladder is provided in the groove to form a closed cavity that communicates with the front opening of the filling channel. The expansion bladder can be inflated to block the insertion hole and the food outlet. The front opening of the flushing channel is in the insertion hole and communicates with the front opening of the feeding channel.

[0008] As an improvement to the technical solution of the nasogastric feeding backwashable catheter device of the present invention, a metal guide wire is provided through the feeding channel of the feeding tube body, and the rear end of the guide wire extends out and can be pinched.

[0009] As an improvement to the technical solution of the nasogastric feeding backflushable catheter device of the present invention, the guidewire extends close to the rear end of the feeding head and leaves a neck gap.

[0010] As an improvement to the technical solution of the nasal feeding backwashable catheter device of the present invention, the front end of the feeding head is provided with a through hole, the guide wire passes through the through hole, and the front end of the guide wire is provided with an elastic, flexible, smooth and soft probing arm.

[0011] As an improvement to the technical solution of the nasogastric feeding backflushable catheter device of the present invention, the length of the guidewire is greater than twice the length of the feeding tube body.

[0012] As an improvement to the technical solution of the nasogastric feeding backflushable catheter device of the present invention, the expansion bladder is provided with a bladder membrane, the front end of the feeding tube body extends forward to form a stepped shape, the filling channel opens on the front end face of the stepped shape, and the feeding channel opens on the secondary front end face; the bladder membrane is located in the middle of the settling trough and is flush with the stepped surface of the feeding tube body, and the bladder membrane is integrally formed with the periphery of the settling trough to enclose the lower settling trough interval to form a bladder cavity; the opening edge of the bladder membrane is bonded to the feeding tube body and the bonding position is located inside the insertion hole.

[0013] As an improvement to the technical solution of the nasogastric feeding backflushable catheter device of the present invention, the feeding head is made of elastic material, the expansion bladder is made of elastic material and is integrally formed with the feeding head; the front end of the feeding head is a smooth bullet shape, and the middle part of the feeding head gradually tapers to the rear end and transitions smoothly.

[0014] As an improvement to the technical solution of the nasogastric feeding backflushing catheter device of the present invention, the rear end of the feeding tube body is connected to a branch connector and correspondingly leads out a feeding branch tube, a flushing branch tube, and a filling branch tube; the rear end of the feeding branch tube is connected to a feeding connector, the rear end of the flushing branch tube is connected to a flushing connector and a plug that blocks the end opening of the flushing connector, and the rear end of the filling branch tube is connected to an airbag indicator bag and a filling connector.

[0015] As an improvement to the technical solution of the nasogastric feeding backwashable catheter device of the present invention, the feeding connector includes a guide wire tube extending coaxially along the feeding branch tube, a feeding nozzle that is connected to the channel inside the feeding branch tube, a plug that can plug the feeding nozzle by being connected to the feeding connector body by a soft band, and a conversion head that can be inserted into the feeding nozzle to expand the inlet interface diameter.

[0016] A method for maintaining a nasogastric feeding backflushing catheter device involves injecting gas or liquid through the filling channel after feeding, causing the expansion bladder to inflate and seal the insertion hole. Then, a cleaning solution is injected through the flushing channel, causing the cleaning solution to flow back from the feeding channel to form a reverse flush of the feeding channel. Finally, air is injected through the flushing channel or a negative pressure is set at the outlet of the feeding channel to discharge the cleaning solution, while keeping the expansion bladder in an inflated state to prevent substances remaining in the intestine from flowing back into the feeding channel and causing blockage.

[0017] The beneficial effects of this invention are as follows: Before feeding via the feeding tube, if the sac is swollen, the internal fluid needs to be extracted through the filling channel, causing it to sink and adhere to the bottom of the sink. After feeding through the feeding tube, fluid (gas or liquid) is injected into the sac through the filling channel, causing the sac to swell and block the insertion hole, thus isolating the feed outlet from the insertion hole. This effectively blocks the feeding tube from the periphery of the feed head placed in the intestine, creating an independent and isolated space between the feeding tube and the flushing channel. At this time, flushing fluid can be injected through the flushing channel to backflush the feeding tube, expelling any remaining food residue from the feeding inlet. This prevents residue from accumulating on the inner wall of the feeding tube and causing blockage, and also prevents residue from adhering to the feeding tube and causing spoilage. This extends the service life of a single nasogastric feeding tube. The nasogastric feeding backflushing catheter device, with its simple structure, can independently backflush to clean the feeding tube and keep the sac swollen to prevent intestinal contents from flowing back into the feeding tube and causing blockage. Attached Figure Description

[0018] Figure 1 This is a side perspective view of the inflated state of the nasogastric feeding backflushable catheter device according to the first embodiment of the present invention.

[0019] Figure 2 This is a frontal perspective view of the inflatable bladder in the inflated state of the first embodiment of the nasogastric feeding backflushable catheter device of the present invention.

[0020] Figure 3 This is a lateral structural diagram of the inflatable bladder in the contracted state of a first embodiment of a nasogastric feeding backflushable catheter device of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the feeding head with half of the inflatable sac removed, representing the first embodiment of a nasogastric feeding backflushable catheter device of the present invention.

[0022] Figure 5 for Figure 4 The diagram shows a three-dimensional structure of the nasogastric feeding backflushable catheter device with the expansion bladder in a contracted state and a portion of the feeding tube body removed.

[0023] Figure 6 This is a three-dimensional structural diagram of the first embodiment of the nasogastric feeding backflushable catheter device of the present invention, showing the removal of the feeding head and the expansion sac.

[0024] Figure 7 This is a schematic diagram of the radial cross-sectional structure of the feeding tube body in a nasogastric feeding backflushable catheter device of the present invention.

[0025] Figure 8 This is a three-dimensional structural schematic diagram of a second embodiment of a nasogastric feeding backflushable catheter device according to the present invention.

[0026] Figure 9 This is a three-dimensional structural schematic diagram from another perspective of a second embodiment of a nasogastric feeding backflushable catheter device of the present invention.

[0027] Figure 10 for Figure 9 The diagram shows a nasogastric feeding backflushable catheter device with half of the feeding head removed. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7As shown, the present invention discloses a nasogastric feeding backwashable catheter device, which includes a feeding tube body 11. The feeding tube body 11 has a feeding channel 12, a flushing channel 13, and a filling channel 14 that are internally connected. A feeding head 21 is fixedly sleeved at the front end of the feeding tube body 11. The rear end of the feeding head 21 has an insertion hole 25 that is sealed and sleeved with the front end of the feeding tube body 11. One side of the feeding head 21 has a food outlet 22. The bottom of the food outlet 22 is recessed to form a groove that communicates with the insertion hole 25. An expansion bladder 28 is provided in the groove, which can form a closed cavity that communicates with the front opening of the filling channel 14. The expansion bladder 28 can be inflated to block the insertion hole 25 and the food outlet 22. The front opening of the flushing channel 13 is inside the insertion hole 25 and communicates with the front opening of the feeding channel 12. Before feeding via tube insertion, if the bladder 28 inflates, the internal fluid needs to be extracted through the filling channel 14, causing it to sink and adhere to the bottom of the trough, thus ensuring that the fluid food flows into the intestine through the feeding channel 12, the insertion hole 25, and the feed outlet 22. After feeding through the feeding channel 12 is completed, fluid, which can be gas or liquid, is injected into the bladder 28 through the filling channel 14, causing the bladder 28 to inflate and block the insertion hole 25, thereby isolating the feed outlet 22 from the insertion hole 25. This effectively blocks the feeding channel 12 from the periphery of the feeding head 21 remaining in the intestine, creating an independent and isolated space between the feeding channel 12 and the flushing channel 13. At this time, flushing fluid can be injected through flushing channel 13 to backflush the feeding channel 12, expelling any remaining food residue from the feeding inlet. This prevents residue from accumulating on the inner wall of the feeding channel 12 and causing blockage, and also prevents residue from adhering to the feeding channel 12 and causing spoilage. This extends the service life of a single nasogastric tube. The outlet of flushing channel 13 is connected to the outlet of feeding channel 12, so flushing channel 13 can also be used as a medication delivery channel. The nasogastric tube backflushing device, with its simple structure, can independently backflush and clean the feeding channel, extending the service life of the nasogastric tube. During non-feeding and non-flushing periods, the expansion bladder is usually inflated to block the feeding channel and feed outlet, preventing backflow and blockage caused by residual backflow material in the feeding channel.

[0030] The feeding channel 12 of the feeding tube body 11 is provided with a metal guide wire 61. The guide wire is rigid and passes through the feeding tube body 11 axially, providing support for the entire feeding tube body 11 and assisting in the forward extension of the soft feeding tube body 11, thus preventing the feeding tube body 11 from bending during insertion. The rear end of the guide wire 61 extends from the rear end of the feeding tube body 11, passes through the feeding branch tube 32, and extends from the rear port of the guide wire conduit. It can be pinched. After the feeding tube body 11 and the feeding head 21 are inserted into place, pinching the rear end of the guide wire 61 allows the guide wire to be pulled out, thus avoiding obstruction of the injection of liquid food such as nutrient solution.

[0031] Furthermore, such as Figure 5 , Figure 7 As shown, the guide wire 61 extends close to the rear end of the feeding head 21, leaving a neck gap. The guide wire 61 does not extend into the feeding head 21 but is close to it with a short length reserved, thus forming a flexible neck. This allows the feeding head 21 to sway at a certain angle, enabling it to turn during insertion and making the insertion smoother. The feeding head 21, neck, and feeding tube body 11 with the guide wire constitute a continuous structure of rigidity and flexibility. The feeding head 21, with its certain rigidity, is inserted at the front; the neck can bend to achieve turning; and the feeding tube body 11 with the guide wire 61 has good strength for better advancement.

[0032] Furthermore, such as Figure 8 , Figure 9 , Figure 10 As shown, the feeding channel 12 of the feeding tube body 11 allows a metal guide wire to pass through. The front end of the feeding head 21 has a through-hole 62 through which the guide wire exits. Because the front end of the feeding head 21 has a through-hole 62, and the guide wire 61 extends beyond the length of the feeding channel 12 and passes through the through-hole 62, the extended portion can be pre-inserted into the nasal cavity. The inserted portion, made of rigid metal, acts as a guide, allowing the feeding head 21 and the feeding tube body 11 to slide smoothly into the nasal cavity. The rigid and thin guide wire 61 is first inserted into the nasal cavity and esophagus, making it easier to insert into the stomach and into the intestines. This guide wire, with its larger cross-section, allows for easier intubation of the feeding head 21, which uses the inserted guide wire as a guide, making the entire intestinal cannulation process much easier.

[0033] Furthermore, such as Figure 8 As shown, the guidewire 61 has a flexible, bendable, smooth, and soft probing arm 66 at its tip, which is visible under ultrasound. The probing arm 66 at the tip of the guidewire 61 is flexible and can bend, so that if the guidewire encounters an obstacle during its forward insertion, it will bend to avoid damaging human tissue. For example, when entering the intestines from the stomach, the guidewire needs to find the entrance before it can be inserted. If the correct position is not found, the probing arm 66 can bend to avoid puncturing the inner surface tissue of the stomach. The flexible probing arm 66 has a tendency to straighten, so it can be pulled back and then straightened again, allowing for further insertion. The flexible probing arm 66 can bend at curved points in tissue cavities, such as the nasal cavity, pharynx, and esophagus. It facilitates the guidance of the guidewire 61 to bend at locations where a change in direction is needed, making guidewire insertion smoother and faster, thus completing the cannulation process.

[0034] The feed outlet 22 is located on the side and is a large open outlet, facilitating the injection of large amounts of liquid food such as nutrient solution. The through-hole 62 is slightly larger than the guide wire 61, providing guidance without obstructing the sliding of the through-hole 62 and guide wire 61, and is relatively smaller than the feed outlet. The feed head 21 has an insertion hole 25 and is fixedly connected to the feed tube body 11, allowing for insertion and withdrawal together.

[0035] Furthermore, such as Figure 9 , Figure 10 As shown, the guidewire 61 is more than twice the length of the feeding tube body 11. In use, the guidewire 61 is first inserted to the predetermined position, then the feeding tube body 11 is fitted over the guidewire 61 and inserted along the guidewire 61 into the intestine. The guidewire 61 is then withdrawn to complete the intubation. With more than half of the guidewire 61 remaining outside the body after insertion to the predetermined position, it is sufficient to fit over the feeding tube body 11 and can extend from the rear end of the feeding tube body 11, facilitating its withdrawal.

[0036] Among them, combined Figure 6 As shown, the expansion bladder 28 is provided with a membrane, and the front end of the feeding tube body 11 extends forward to form a stepped shape. The membrane is fixedly adhered to the stepped surface. The filling channel 14 opens at the front end face of the stepped shape, and the feeding channel 12 opens at the secondary front end face. This provides a surface that facilitates bonding between the outlet of the filling channel 14 and the outlet of the feeding channel 12, making it easy to distinguish and isolate them. Thus, the filling channel 14 has a separate outlet position, providing an independent space for individual fluid filling. The filling fluid can be gas or liquid. Gas is readily available, while liquid can provide more stable and higher pressure, preventing leakage of flushing fluid during flushing.

[0037] Furthermore, in combination Figure 5As shown, the membrane is located in the middle of the settling trough and flush with the stepped surface of the feeding tube body 11, facilitating its fitting and connection with the extended stepped portion of the feeding tube body 11. The membrane is integrally formed with the periphery of the settling trough, enclosing the lower settling trough space to form a cavity, thus allowing the membrane and the feeding head to be integrally formed. The expansion bladder 28 can also be a separate bladder. The opening of the expansion bladder 28 can be fitted over the outlet of the filling channel 14 and sealed to form a barrier. The constructed expansion bladder 28 or a separate expansion bladder 28 can be filled to form a barrier, thereby blocking the outlets of the feeding channel 12 and the rinsing channel 13, causing the rinsing liquid injected through the rinsing channel 13 to flow back out of the feeding channel 12, forming a backwash. The rinsing process can generate positive pressure on the rinsing channel 13, thereby continuously injecting rinsing liquid into the feeding channel 12 and causing it to flow back out from the feeding inlet along with the residue in the channel, achieving the rinsing and cleaning treatment of the feeding channel 12. This rinsing process can also be achieved by generating negative pressure on the rinsing channel 13, thereby creating a suction effect on the expansion bladder 28, causing the expansion bladder 28 to tend to squeeze inward into the insertion hole 25, thus forming an increasingly tight sealing barrier effect and a better anti-leakage effect.

[0038] Furthermore, the opening edge of the capsule is bonded to the feeding tube body 11 and the bonding position is located inside the insertion hole 25, so that when the inflatable bladder 28 is inflated, it is at least partially located inside the insertion hole 25, thereby forming an effective barrier.

[0039] The feeding head 11 is made of an elastic material, and the expansion bladder is also made of an elastic material and integrally molded with the feeding head. It uses non-toxic, flexible materials such as silicone or other gels, resulting in less rejection and pressure damage when inserted into the esophagus and digestive tract, making it safer. The front end of the feeding head 21 is a smooth, bullet-shaped tip, making insertion smoother and preventing damage to tissue surfaces along the feeding head's path. The feeding head 21 gradually tapers towards the rear end with a smooth transition, making removal of the feeding tube smoother and preventing damage to corresponding tissue surfaces.

[0040] The rear end of the feeding tube body 11 is connected to a branch connector 31, from which feed branch tubes 32, flushing branch tubes 33, and filling branch tubes 34 are led out. Each branch tube corresponds to a channel within the feeding tube body 11. Feed branch tube 32 connects to the feed channel 12, flushing branch tube 33 connects to the flushing channel 13, and filling branch tube 34 connects to the filling channel 14, thus forming a three-part tube structure for convenient internal insertion and external operation. The rear end of the feed branch tube 32 is connected to a feeding connector 52 for easy connection to nutrient solution or other liquid food. A guide wire is inserted through this branch tube and channel for insertion guidance, improving the rigidity of the tube and facilitating insertion. The guide wire can also be used for unblocking. Feeding and guide wire guidance can be performed simultaneously. The rear end of the flushing branch pipe is connected to a flushing connector 53 and a plug that seals the end opening of the flushing connector. When not in use, the connector can be plugged to keep it clean and prevent contamination. When in use, the plug can be opened to inject flushing fluid for flushing, or medication can be added through this passage, allowing medication to be added simultaneously with feeding. The rear end of the filling branch pipe 34 is connected to an air bladder indicator bladder and a filling connector 54. The filling connector 54 can be connected to external equipment or filling devices (syringes, etc.) to inject fluid. The air bladder indicator bladder changes synchronously with the expansion bladder 28, reflecting the state of the internal expansion bladder 28. Therefore, the expansion state of the expansion bladder 28 located in the intestine can be evaluated and inferred using the externally provided air bladder indicator bladder. The feeding branch pipe 32 and the flushing branch pipe 33 are equipped with clamps 36 to close the corresponding branch pipes and passages when not in use, isolating them from the outside world and preventing contamination.

[0041] Furthermore, the feeding connector 52 includes a guide wire conduit 56 extending coaxially along the feeding branch tube, a feeding nozzle 55 communicating with the inner channel of the feeding branch tube, a plug 59 connected to the feeding connector body via a soft band to seal the feeding nozzle, and a conversion head 58 that can be inserted into the feeding nozzle to enlarge the inlet interface diameter. The feeding nozzle 55 can be tilted to the feeding branch tube 32 and forms a three-way passage with the guide wire conduit 56, together constituting the feeding connector body. The guide wire can be smoothly inserted into the feeding channel 12 from the inner lumen of the guide wire conduit 56 along the feeding branch tube 32, so that the feeding channel 12 can be used for guiding the insertion of the guide wire, facilitating tube insertion, and can also be used as a channel for injecting liquid food. The three-way passage structure allows the feeding nozzle and guide wire to be used simultaneously, guiding through the guide wire while injecting liquid food through the feeding nozzle.

[0042] A maintenance method for a nasogastric feeding backflushable catheter device involves injecting gas or liquid through the filling channel after feeding to inflate the bladder and seal it in the insertion hole. Then, cleaning fluid is injected through the flushing channel, causing it to flow back into the feeding channel, creating a reverse flush. Finally, air is injected through the flushing channel or negative pressure is applied at the feeding channel outlet to expel the cleaning fluid, maintaining the inflated bladder to prevent reflux of digestive contents into the feeding channel and causing blockage. When inflated, the bladder forms a positive diameter difference with the tube body to enhance the catheter's stability in the intestines. This maintenance method keeps the feeding channel clean for extended periods during feeding intervals, preventing blockages and nutrient spoilage, and preventing reflux of gastrointestinal contents into the feeding channel, thus extending its service life.

[0043] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A nasogastric, flushable-back, catheter device comprising a feeding tube body, characterized by: The feed tube body has a feeding channel, a rinsing channel, and a filling channel running through it. A feeding head is fixedly sleeved at the front end of the feed tube body. The rear end of the feeding head has an insertion hole that is sealed and sleeved with the front end of the feed tube body. One side of the feeding head has a feed outlet. The bottom of the feed outlet is recessed to form a trough that communicates with the insertion hole. The trough has an expansion bladder that can form a closed cavity that communicates with the front opening of the filling channel. The expansion bladder can be inflated to block the insertion hole and the feed outlet. The front opening of the rinsing channel is inside the insertion hole and communicates with the front opening of the feeding channel.

2. The nasogastric flushable catheter device of claim 1, wherein: The feeding channel of the feeding tube body is provided with a metal guide wire, the rear end of which extends out and can be pinched.

3. The nasogastric flushable catheter device of claim 2, wherein: The guidewire extends close to the rear end of the feeding head, leaving a neck clearance.

4. The nasogastric flushable catheter device of claim 2, wherein: The feeding head has a through hole at its front end, through which the guide wire passes. The front end of the guide wire has a flexible, bendable, smooth and soft probing arm.

5. The nasogastric flushable catheter device of claim 4, wherein: The length of the guide wire is more than twice the length of the feed tube body.

6. The nasogastric feeding backflushable catheter device according to claim 1, characterized in that: The expansion bladder is provided with a membrane, and the front end of the feeding tube body extends forward to form a stepped shape. The filling channel opens on the front end face of the stepped shape, and the feeding channel opens on the secondary front end face. The membrane is located in the middle of the settling trough and is flush with the stepped surface of the feeding tube body. The membrane is integrally formed with the periphery of the settling trough to enclose the lower settling trough interval to form a bladder cavity. The opening edge of the membrane is bonded to the feeding tube body, and the bonding position is located inside the insertion hole.

7. The nasogastric tube device of claim 1, wherein: The feeding head is made of an elastic material, and the expansion bladder is made of an elastic material and is integrally formed with the feeding head; the front end of the feeding head is a smooth bullet shape, and the middle part of the feeding head gradually tapers to the rear end with a smooth transition.

8. The nasogastric tube device of claim 1, wherein: The rear end of the feeding tube body is connected to a branch connector, which leads out a feeding branch tube, a flushing branch tube, and a filling branch tube accordingly; the rear end of the feeding branch tube is connected to a feeding connector, the rear end of the flushing branch tube is connected to a flushing connector and a plug that blocks the end opening of the flushing connector, and the rear end of the filling branch tube is connected to an air bladder indicator bladder and a filling connector.

9. The nasogastric flushable catheter device of claim 8, wherein: The feeding connector includes a guide wire extending coaxially along the feeding tube, a feeding nozzle that is connected to the channel inside the feeding tube, a plug that can plug the feeding nozzle and is connected to the feeding connector body by a soft band, and a conversion head that can be inserted into the feeding nozzle to enlarge the inlet interface diameter.

10. A method of maintaining a nasogastric, back-flushable catheter device, the method comprising: After feeding is completed using the nasogastric feeding backflushing catheter device according to any one of claims 1-9, gas or liquid is injected through the filling channel to inflate the bladder and seal it in the insertion hole. Then, cleaning fluid is injected through the flushing channel to cause the cleaning fluid to flow back from the feeding channel, forming a reverse flush of the feeding channel. Finally, air is injected through the flushing channel or negative pressure is set at the outlet of the feeding channel to discharge the cleaning fluid, while keeping the bladder in an inflated state to prevent substances remaining in the intestine from flowing back into the feeding channel and causing blockage.

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