A portable visual nasogastric tube placement device

Abstract

The present application relates to the technical field of medical devices, in particular to a portable visualized nasogastric and enteric feeding tube placement device, comprising an operating handle, an endoscope assembly, a guide wire and a shaping mechanism, wherein the endoscope assembly is connected to the operating handle and can be controlled by the operating handle and is used to view the conditions in the patient's body; the nasogastric and enteric feeding tube is sleeved on the endoscope assembly during installation; the guide wire is inserted into the endoscope assembly and is used to support the endoscope assembly; the shaping mechanism is configured to restore the cross-sectional shape of the nasogastric and enteric feeding tube with a curvature greater than a preset value to a circular shape and to fix the shape of the nasogastric and enteric feeding tube with a curvature greater than the preset value. Thus, on the one hand, the cross section of the nasogastric and enteric feeding tube can be circular when delivering nutrient solution or drugs, avoiding the risk of blockage, and on the other hand, the elastic restoring force generated at the bending part of the nasogastric and enteric feeding tube can be offset, avoiding the continuous pressure of the nasogastric and enteric feeding tube on the mucosa and tissues in the human body.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a portable, visual nasogastric feeding tube placement device. Background Technology

[0002] As an important medical interventional device in clinical practice, the nasogastric feeding tube is inserted into the stomach or intestine through the nasal cavity. It plays a crucial role in delivering nutritional solutions, administering precise medications, and performing gastrointestinal decompression for patients who are unable to eat orally.

[0003] In the clinical placement of nasogastric feeding tubes, blind insertion is currently the mainstream method used in most scenarios in the industry. This method mainly relies on the doctor's clinical experience, operational feel, and prediction of the patient's body structure. Although it has advantages such as simple operation and no need for special equipment assistance, its success rate and safety can fluctuate to some extent due to factors such as individual differences in body structure and patient cooperation.

[0004] While endoscopic-assisted catheter placement technology has emerged in the market, its operational mode has significant limitations: the feeding tube is inserted through the nasal cavity, while the endoscope is inserted through the oral cavity, resulting in separate pathways. During the procedure, the endoscope can only provide internal imaging information, serving an "observation" function, and cannot apply direct external force to adjust the direction and path of the feeding tube. This means that the accuracy of catheter placement in complex body structures (such as the pharynx and the gastroduodenal junction) still needs improvement.

[0005] To address the aforementioned issues, for example, Chinese patent application CN115089102A discloses an endoscopic device for navigation of enteral nutrition delivery tubes. This device optimizes the insertion process of the nutrition tube through the coordinated operation of the guidewire mechanism and the insertion tube mechanism: the guidewire mechanism can provide support for the insertion tube mechanism and assist it in completing bending activities, thereby reducing ineffective operations and effectively shortening the insertion time.

[0006] However, in actual clinical applications, this endoscopic device for guiding enteral nutrition tubes still faces new challenges due to the unique structure of the human body: natural physiological bends exist at the junctions of the nasal cavity and larynx, the larynx and stomach, and the stomach and intestines, and these bends generally have significant curvatures. When the feeding tube passes through these areas, its walls inevitably adhere tightly to the side walls of the larynx, stomach, or intestines due to the constraints of these bends. Because the feeding tube itself has elastic resilience, it tends to straighten under these conditions, leading to two adverse effects. Consequences: On the one hand, the cross-section of the feeding tube will be compressed from a circle to an ellipse, resulting in a reduction in the effective inner diameter of the lumen, which can easily cause obstruction of nutrient solution delivery or drug deposition, increasing the risk of blockage; on the other hand, the feeding tube will continuously press against the side wall tissue of the larynx, stomach tube or intestine. With the normal peristalsis or swallowing action of the human digestive tract, the pressing position will be repeatedly rubbed and pulled. After long-term placement, it may lead to local mucosal congestion, edema, erosion or even ulceration. In severe cases, it may also cause serious complications such as perforation, which will adversely affect the patient's treatment safety and comfort. Summary of the Invention

[0007] Therefore, it is necessary to provide a portable, visual nasogastric feeding tube placement device to address the safety concerns associated with current nasogastric feeding tubes after placement in patients.

[0008] The above objectives are achieved through the following technical solutions:

[0009] A portable, visual nasogastric feeding tube placement device, the portable, visual nasogastric feeding tube placement device comprising:

[0010] Operating handle;

[0011] An endoscope assembly is connected to and controlled by the operating handle and configured to view the patient's internal condition; a nasogastric feeding tube is fitted onto the endoscope assembly during installation.

[0012] A guidewire is inserted into the endoscope assembly and configured to support the endoscope assembly.

[0013] The shaping mechanism is configured to both restore the cross-sectional shape of the nasogastric feeding tube with a curvature greater than a preset value to a circle and to fix the shape of the nasogastric feeding tube with a curvature greater than a preset value.

[0014] Furthermore, the shaping mechanism includes a spiral tube and multiple support frames. The spiral tube is helically inserted into the side wall of the nasogastric feeding tube and configured to receive fluid. The support frames are tubular structures, inserted into the side wall of the nasogastric feeding tube, and sleeved on the spiral tube. The multiple support frames are arranged along the extension direction of the nasogastric feeding tube. The support frames include multiple support vertical tubes and multiple support ring tubes. The multiple support vertical tubes are arranged circumferentially, and the multiple support ring tubes are arranged axially along the support vertical tubes. The spiral tube, the support vertical tubes, and the support ring tubes are interconnected. A one-way valve is inserted at the connection between the support vertical tubes and the support ring tubes. The one-way valve is configured to be in an open state when the nasogastric feeding tube is stretched.

[0015] Furthermore, the one-way valve includes two valve bodies, which are integrally formed on the two opposing inner pipe walls of the supporting vertical pipe and arranged axially to form a stop fit.

[0016] Furthermore, each of the supporting vertical tubes has a limiting part inserted inside its side wall. The limiting part is a corrugated mesh structure and includes multiple first supporting rings and multiple connecting strips. The multiple first supporting rings are arranged at intervals along the axial direction, and the connecting strips are connected between two adjacent first supporting rings. Each of the supporting ring tubes has multiple second supporting rings inserted inside its side wall. The multiple second supporting rings are arranged at intervals along the axial direction.

[0017] Furthermore, both the limiting part and the second support ring are made of carbon fiber.

[0018] Furthermore, the fluid is air.

[0019] Furthermore, the portable visual nasogastric feeding tube placement device also includes an inflator configured to inflate the spiral tube with air.

[0020] Furthermore, the portion of the nasogastric feeding tube with a curvature greater than a preset value includes at least the connection between the patient's nasal cavity and larynx, the connection between the patient's larynx and stomach, and the connection between the patient's stomach and intestines.

[0021] Furthermore, the end of the guidewire away from the operating handle is located inside the nasogastric feeding tube.

[0022] Furthermore, the end of the endoscope assembly located away from the operating handle is situated inside the nasogastric feeding tube.

[0023] The beneficial effects of this invention are:

[0024] This invention relates to a portable, visual nasogastric feeding tube placement device. By setting a shaping mechanism, after the nasogastric feeding tube is placed in the patient's body, it can both restore the cross-sectional shape of the nasogastric feeding tube with a curvature greater than a preset value to a circular shape, ensuring that the risk of blockage is avoided when delivering nutritional solutions or drugs; and fix the shape of the nasogastric feeding tube with a curvature greater than the preset value, so as to counteract the elastic restoring force generated by the nasogastric feeding tube at the bend, avoiding the continuous pressure of the nasogastric feeding tube on the mucous membrane and tissues in the human body, and ensuring the safe use of the nasogastric feeding tube. Attached Figure Description

[0025] Figure 1 A three-dimensional structural schematic diagram of the portable visual nasogastric nutrition tube placement device provided in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified schematic diagram of the structure at the U-shaped section;

[0027] Figure 3 A top view of the portable visual nasogastric nutrition tube placement device provided in an embodiment of the present invention;

[0028] Figure 4 for Figure 3 Sectional view along the AA direction;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point V in the middle;

[0030] Figure 6 A three-dimensional structural schematic diagram of the fixed mechanism of the portable visual nasogastric nutrition tube placement device provided in an embodiment of the present invention;

[0031] Figure 7 for Figure 6 A magnified schematic diagram of the structure at point W in the middle;

[0032] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point X in the middle;

[0033] Figure 9 A cross-sectional structural schematic diagram of the fixed mechanism of the portable visual nasogastric nutrition tube placement device provided in an embodiment of the present invention;

[0034] Figure 10 for Figure 9 A magnified schematic diagram of the structure at point Y in the middle;

[0035] Figure 11 for Figure 10 A magnified schematic diagram of the structure at point Z in the middle.

[0036] in:

[0037] 1. Operating handle;

[0038] 2. Endoscope assembly;

[0039] 3. Guidewire;

[0040] 41. Spiral tube; 42. Support frame; 421. Supporting vertical tube; 4211. Limiting part; 42111. First support ring; 42112. Connecting strip; 422. Support ring tube; 4221. Second support ring; 43. One-way valve; 431. Valve body;

[0041] 5. Nasogastric feeding tube; 51. Receiver head; 52. Atmospheric connection valve; 53. Air inlet. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0043] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] The following reference Figures 1 to 11The portable visual nasogastric feeding tube placement device provided in the embodiments of the present invention is particularly suitable for placing nasogastric feeding tube 5, and of course, it is also suitable for placing other feeding tubes.

[0046] Specifically, the portable visual nasogastric feeding tube placement device includes an operating handle 1, with an endoscope assembly 2 connected to the operating handle 1 for viewing the patient's internal condition. A guidewire 3 is inserted into the endoscope assembly 2 for supporting it. The nasogastric feeding tube 5 is fitted onto the endoscope assembly 2 during installation, facilitating its insertion into the patient's body. The endoscope assembly 2 can be controlled by the operating handle 1 to change the orientation of the nasogastric feeding tube 5, allowing it to move in different directions within the patient's body. The endoscope assembly 2 can be configured with the same insertion mechanism as disclosed in CN115089102A or other similar structures; this is prior art and will not be described further. The guidewire 3 can be configured with the same mechanism as disclosed in CN115089102A or other similar structures; this is prior art and will not be described further. A receiving head 51 and an atmospheric connection valve 52 are fixedly installed on the outer peripheral wall of the top of the nasogastric feeding tube 5. The receiving head 51 is connected to the nasogastric feeding tube 5 to facilitate the delivery of nutrient solution or medicine to the patient through the nasogastric feeding tube 5. The atmospheric connection valve 52 is used to connect the nasogastric feeding tube 5 to the atmospheric environment to ensure that the air pressure balance inside the nasogastric feeding tube 5 can be maintained, so that the nutrient solution or medicine can smoothly enter the patient's body through the nasogastric feeding tube 5.

[0047] During intubation, the endoscopic assembly 2 is used to observe the patient's internal condition while simultaneously guiding the nasogastric feeding tube 5 deeper into the patient's body. After intubation, the endoscopic assembly 2, along with the guide wire 3, is removed from the nasogastric feeding tube 5. Then, the atmospheric connection valve 52 is opened, and nutrient solution or medication can be delivered to the patient through the receiving head 51.

[0048] However, the human digestive tract has many natural physiological bends, especially in the areas connecting the nasal cavity and larynx, the larynx and stomach, and the stomach and intestines. These bends exhibit distinct arc-like characteristics. When the nasogastric feeding tube 5 passes through these bends, due to the spatial constraints of the patient's body structure, the tube body inevitably adheres to the corresponding digestive tract wall. Because the nasogastric feeding tube 5 possesses elastic recovery properties, it naturally generates a restoring force tending towards a straight shape when bent. This mechanical characteristic causes two problems: First, after being compressed at the bends, the original circular cross-section of the nasogastric feeding tube 5 changes shape, tending towards ellipticity. This change directly reduces the effective channel area of ​​the lumen, making it easier for the flow of nutrient solution or medication to be obstructed during delivery. It also increases the possibility of drug deposition on the tube wall, thereby increasing the risk of tube blockage. Secondly, the repositioning force will cause the nasogastric feeding tube 5 to continuously exert pressure on the wall of the digestive tract it is attached to. During the normal peristalsis and swallowing process of the human digestive tract, this pressure point will be repeatedly subjected to friction and traction. Under long-term action, the local mucosal tissue will be damaged due to continuous mechanical stimulation, which may manifest as inflammatory reactions such as congestion and edema. In severe cases, it may develop into mucosal erosion, ulceration, or even pose a potential risk of causing digestive tract perforation, ultimately adversely affecting the patient's treatment safety and physiological comfort.

[0049] Based on this, the portable visual nasogastric feeding tube placement device provided in this embodiment of the invention is further configured to include a shaping mechanism, which is capable of both restoring the cross-sectional shape of the nasogastric feeding tube 5 with a curvature greater than a preset value to a circular shape and fixing the shape of the nasogastric feeding tube 5 with a curvature greater than a preset value. Thus, after the nasogastric nutrition tube is placed in the patient's body, on the one hand, the shaping mechanism adjusts the structure to restore the tube cross-section in that area from a non-circular shape due to pressure deformation to its initial circular state. This process, with the synergistic effect of the internal support structure, counteracts the compressive stress generated by the tube bending and conforming to the digestive tract wall, ensuring that the lumen maintains a complete circular channel shape. Therefore, the nutrient solution or medication can maintain smooth flow during delivery, avoiding obstruction of flow due to deformation of the lumen cross-section, fundamentally reducing the possibility of drug deposition or lumen blockage.

[0050] On the other hand, the shaping mechanism can fix the shape of the tube in the curved area through its own rigidity, forming a stable force balance. It can counteract the straightening force generated by the elasticity of the feeding tube, so that the tube body maintains a shape that conforms to the digestive tract structure at the curved part, and no longer exerts continuous pressure on the tube wall tissue. This fixing effect cuts off the mechanical confrontation between the elastic force of the tube body and the tube wall tissue, reducing the friction and traction stimulation caused by human digestive tract peristalsis or swallowing, thereby avoiding the risk of local mucosal congestion, edema and even more serious tissue damage after long-term placement, effectively ensuring the safety and patient comfort during the use of the feeding tube.

[0051] Specifically, the shaping mechanism includes a spiral tube 41 and multiple supporting frames 42. The spiral tube 41 is spirally inserted into the side wall of the nasogastric feeding tube 5, and the spiral axis of the spiral tube 41 coincides with the axis of the nasogastric feeding tube 5. The spiral tube 41 is used to receive fluid, which can be air. An air inlet 53 is provided on the top outer peripheral wall of the nasogastric feeding tube 5. The air inlet 53 is located below the atmospheric communication valve 52 and is connected to the spiral tube 41. The portable visual nasogastric feeding tube placement device also includes an air inflation component, which can be an air pump or an air compressor. The air outlet of the air pump or air compressor is connected to the air inlet 53 to facilitate the introduction of air into the spiral tube 41 through the air inlet 53.

[0052] The support frame 42 is a tubular structure and is coaxially inserted into the side wall of the nasogastric feeding tube 5, and sleeved on the spiral tube 41. Three support frames can be provided, located at the connection points of the nasal cavity and larynx, the larynx and stomach, and the stomach and intestines, respectively, to restore the circular shape and form of the nasogastric feeding tube 5 at the three bends mentioned above. The support frame 42 includes multiple support vertical tubes 421 and multiple support ring tubes 422. For example, with six support vertical tubes 421, they are evenly arranged circumferentially. With ten support ring tubes 422, they are evenly spaced axially. The two support ring tubes 422 at each end are located at the two ends of the support vertical tubes 421, and each support vertical tube 421 is connected to all the support ring tubes 422. The spiral tube 41 is also connected to all the support ring tubes 422, ensuring that air can be transmitted to each support vertical tube 421 and support ring tube.

[0053] Inside the support riser 421, one-way valves 43 are inserted on both the upper and lower sides of the same support ring 422. Each one-way valve 43 has two valve bodies 431, integrally formed on opposite inner walls of the support riser 421 and arranged axially to form a stop. Initially, the one-way valves 43 are closed. In the outer region of the bend in the nasogastric feeding tube 5, the tube wall is stretched due to the bend, and the corresponding support riser 421 stretches synchronously with the tube wall. This stretching action causes the two valve bodies 431 of the same one-way valve 43 within the support riser 421 to separate, creating a flow gap, thus connecting the support riser 421 with the support ring 422. At this time, air can enter the support riser 421 in this region through the connecting channel, giving it a certain rigidity due to inflation. This rigidity is transmitted to the tube wall of the nasogastric feeding tube 5, effectively resisting the straightening tendency caused by elastic recovery, thereby stably maintaining the shape of the tube at the bend.

[0054] In the inner region of the nasogastric feeding tube 5 at the bend, the tube wall is compressed due to the bend, and the corresponding support riser 421 is compressed synchronously with the tube wall. This compression causes the two valves 431 of the same one-way valve 43 to fit tightly together, forming a closed state and blocking the airflow channel between the support riser 421 and the support ring tube 422. In this state, the inner support riser 421 will not be additionally inflated, avoiding abnormal changes in the tube shape due to excessive support, thereby ensuring the adaptability of the overall structure of the nasogastric feeding tube 5 to the curvature of the digestive tract and maintaining the stability of the basic shape of the tube.

[0055] After the nasogastric nutrition tube 5 is placed in the patient's body, the spiral tube 41 and the supporting frame 42 inside the nasogastric nutrition tube 5 at the bend are both in a bent state, and their cross-sectional shapes are approximately elliptical. The side wall of the nasogastric nutrition tube 5 at the bend is in a stretched state, and the supporting vertical tube 421 inside is also in a stretched state, which creates a gap between the two valves 431 of the same one-way valve 43, thereby connecting the supporting vertical tube 421 and the supporting ring tube 422. Then, the air pump is manually operated to inflate the spiral tube 4 through the air inlet 53. 1. Air is introduced into the internal structure, and then the air enters the support ring tube 422 from the spiral tube 41, thereby supporting the support ring tube 422 and restoring its cross-sectional shape to a circular shape. The support ring tube 422 simultaneously drives the cross-sectional shape of the bent part of the nasogastric feeding tube 5 to return to a circular shape, ensuring that the risk of blockage is avoided when delivering nutrient solution or medicine. At the same time, the spiral tube 41 delivers air to the support vertical tube 421 located on the outside, giving it a certain rigidity, thereby ensuring that the nasogastric feeding tube 5 can maintain its current shape.

[0056] When processing the shaping mechanism, the spiral tube 41 and the support frame 42 can be processed separately, ensuring that both the spiral tube 41 and the support ring tube 422 have reserved connecting holes. Then, the connecting holes on the spiral tube 41 and the connecting holes on the support ring tube 422 are connected accordingly, and then the spiral tube 41 and the support ring tube 422 are bonded together with sealant. When assembling the shaping mechanism and the nasogastric feeding tube 5, the inner layer of the nasogastric feeding tube 5 can be processed first, and then the spiral tube 41 and the support frame 42 can be fitted onto the inner layer as a whole. Finally, the outer layer of the nasogastric feeding tube 5 can be processed by injection molding.

[0057] In a further embodiment, to avoid excessive deformation of the support frame 42 and ensure the safety of the nasogastric feeding tube 5, a limiting part 4211 is inserted into the side wall of each support vertical tube 421. The limiting part 4211 is a corrugated mesh structure and is coaxially arranged with the support vertical tube 421. It includes multiple first support rings 42111 and multiple connecting strips 42112. The multiple first support rings 42111 are arranged at intervals along the axial direction, so that the support vertical tube 421 does not have the freedom to expand circumferentially, and thus cannot expand the nasogastric feeding tube 5. The connecting strips 42112 are connected between two adjacent first support rings 42111, so that the support vertical tube 421 has the freedom to extend and retract axially, avoiding affecting the bending and deformation of the nasogastric feeding tube 5. Multiple second support rings 4221 are inserted inside the side wall of each support ring tube 422. The second support rings 4221 and the support ring tube 422 are coaxially arranged. The multiple second support rings 4221 are arranged at intervals along the axial direction, so that the support ring tube 422 does not have the freedom to expand in the circumferential direction, and thus cannot expand the nasogastric feeding tube 5.

[0058] Understandably, the limiting part 4211 and the second support ring 4221 can both be made of carbon fiber to ensure lightweight design.

[0059] In other embodiments, to avoid damage to the mucous membranes and tissues in the human body caused by the guidewire 3 and the endoscope assembly 2, the end of the guidewire 3 away from the operating handle 1 is positioned inside the nasogastric feeding tube 5, and the end of the endoscope assembly 2 away from the operating handle 1 is also positioned inside the nasogastric feeding tube 5. This ensures that the portion in direct contact with the mucous membranes and tissues in the human body is the nasogastric feeding tube 5, which is typically made of a soft material, thus minimizing damage to the mucous membranes and tissues in the human body.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A portable visualized nasogastric-enteral feeding tube placement device, comprising: The portable, visual nasogastric nutrition tube placement device includes: Operating handle; An endoscope assembly is connected to and controlled by the operating handle and configured to view the patient's internal condition; a nasogastric feeding tube is fitted onto the endoscope assembly during installation. A guidewire is inserted into the endoscope assembly and configured to support the endoscope assembly. The shaping mechanism is configured to both restore the cross-sectional shape of the nasogastric feeding tube with a curvature greater than a preset value to a circle and to fix the shape of the nasogastric feeding tube with a curvature greater than a preset value. The shaping mechanism includes a spiral tube and multiple support frames. The spiral tube is helically inserted into the side wall of the nasogastric feeding tube and configured to receive fluid. The support frames are tubular structures inserted into the side wall of the nasogastric feeding tube and sleeved onto the spiral tube. The multiple support frames are arranged along the extension direction of the nasogastric feeding tube. Each support frame includes multiple support vertical tubes and multiple support ring tubes. The multiple support vertical tubes are arranged circumferentially, and the multiple support ring tubes are arranged axially along the support vertical tubes. The spiral tube, the support vertical tubes, and the support ring tubes are interconnected. A one-way valve is inserted at the connection between the support vertical tubes and the support ring tubes. The one-way valve is configured to be open when the nasogastric feeding tube is stretched.

2. The portable visual nasogastric-enteral feeding tube placement device of claim 1, wherein, The one-way valve includes two valve bodies, which are integrally formed on the two opposing inner pipe walls of the supporting vertical pipe and arranged axially to form a stop fit.

3. The portable visual nasogastric-enteral feeding tube placement device of claim 1, wherein, Each of the supporting vertical tubes has a limiting part inserted inside its side wall. The limiting part is a corrugated mesh structure and includes multiple first supporting rings and multiple connecting strips. The multiple first supporting rings are arranged at intervals along the axial direction, and the connecting strips are connected between two adjacent first supporting rings. Each of the supporting ring tubes has multiple second supporting rings inserted inside its side wall. The multiple second supporting rings are arranged at intervals along the axial direction.

4. The portable visual nasogastric-enteral feeding tube placement device of claim 3, wherein, Both the limiting part and the second support ring are made of carbon fiber.

5. The portable visual nasogastric-enteral feeding tube placement device of claim 1, wherein, The fluid is air.

6. The portable visual nasogastric-enteral feeding tube placement device of claim 5, wherein, The portable visual nasogastric feeding tube placement device also includes an inflator configured to inflate the spiral tube with air.

7. The portable visual nasogastric feeding tube placement device of claim 1, wherein, The portion of the nasogastric feeding tube with a curvature greater than a preset value includes at least the connection between the patient's nasal cavity and larynx, the connection between the patient's larynx and stomach, and the connection between the patient's stomach and intestines.

8. The portable visual nasogastric feeding tube placement device of claim 1, wherein, The end of the guidewire away from the operating handle is located inside the nasogastric feeding tube.

9. The portable visual nasogastric feeding tube placement device of claim 1, wherein, The end of the endoscope assembly away from the operating handle is located inside the nasogastric feeding tube.

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