No-side-hole type enteral nutrition pusher

Abstract

The utility model provides a side-hole-free type enteral nutrition pusher. The side-hole-free type enteral nutrition pusher comprises a nutrition tube, a supporting tube and a pathfinding catheter which are sequentially arranged from inside to outside, the supporting tube is movably arranged in the nutrient tube in a penetrating manner so as to search the pylorus or the output loop after reaching the gastral cavity position; the pathfinding catheter is movably supported within the tube to enter the duodenum and advance to the jejunum position after reaching the pylorus position. According to the utility model, the pylorus or the output loop can be found, the operation difficulty of the nutrient canal and the discomfort of a patient caused by repeatedly rubbing the nasal cavity in the operation process are reduced, and the nutrient canal also plays a good auxiliary role in passing through the narrow section of the intestinal tract; the far end of the nutrition tube without the side hole structure design reaches the jejunum and can be directly used as a nutrition delivery tube, and the nutrition tube is particularly suitable for pancreatitis patients who are coma or cannot eat independently and need jejunum nutrition support.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments and relates to an enteral nutrition auxiliary pushing device, in particular to an enteral nutrition pusher without side holes. Background Art

[0002] Currently, there are two conventional methods for placing feeding tubes: oral placement under digestive endoscopy and nasal placement under DSA. The advantage of placing feeding tubes through the mouth under endoscopy is that the gastric cavity segment has good support, which is conducive to pushing the guide wire to the distal end. The disadvantage is that it is not easy for the gastroscope to pass through the stenotic segment, and it is impossible to judge the condition and insertion depth of the guide wire distal to the stenotic segment. The conventional nasal placement method under DSA has poor support for the catheter guide wire in the gastric cavity segment due to the receptive expansion of the gastric cavity, which is not conducive to delivering the guide wire catheter to the duodenum and distal jejunum. In addition, it is difficult to find the output loop of the stomach pylorus or gastric surgery, which increases the difficulty of placing feeding tubes under DSA. In addition, the nasal cavity will be repeatedly rubbed during the operation, causing pain to the patient.

[0003] For pancreatitis patients who are in a coma or unable to eat independently and require jejunal nutritional support, the two conventional methods of placing nutritional tubes mentioned above both require placing the guide wire in a satisfactory position before inserting the nutritional tube through the guide wire. The entire process is inconvenient to operate and is prone to surgical failure due to insufficient support strength or slippage of the guide wire. Utility Model Content

[0004] The utility model aims at pancreatitis patients who are in a coma or cannot eat independently and need jejunal nutritional support. It proposes a side-hole-free enteral nutrition pusher that can greatly reduce the difficulty of placing a nutrition tube.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A side-hole-free enteral nutrition pusher comprises a nutrition tube, a support tube and a pathfinder catheter arranged in sequence from the inside out, wherein: the support tube is movably arranged in the nutrition tube to reach the gastric cavity position and then explore the pylorus or efferent loop; the pathfinder catheter is movably arranged in the support tube to reach the pylorus position and then enter the duodenum and move to the jejunum position.

[0007] Preferably, the nutrition tube is straight-cylindrical, with a length of 1.3 to 2.0 m, an outer diameter of 4.35 to 5.33 mm, and an inner diameter of 3.0 to 4.05 mm.

[0008] Preferably, the proximal end of the nutrition tube is a two-way joint structure, including a first sleeve joint formed by the proximal end thereof and a second sleeve joint located on one side of the first sleeve joint;

[0009] The second sleeve joint is arranged obliquely relative to the first sleeve joint, with an included angle of 30 to 60 degrees.

[0010] Preferably, a first positioning mark is provided on the nutrition tube at a position 80 to 90 cm away from the proximal end, and the first positioning mark is annular or linear.

[0011] Preferably, the length of the support tube is 1.6 to 1.8 m, which is 20 to 30 cm longer than the length of the nutrition tube, and the outer diameter is 2.6 to 4.0 mm and the inner diameter is 1.56 to 2.0 mm.

[0012] More preferably, the distal end of the support tube is a curved and pre-shaped exposed section, with an angle of 25 to 90° relative to its longitudinal direction.

[0013] More preferably, the length of the exposed section is 20 to 30 cm, and the diameter thereof gradually decreases from the proximal end to the distal end;

[0014] The outer diameter of the exposed section gradually decreases to 2.6-2.95 mm from the proximal end to the distal end; and the inner diameter of the exposed section gradually decreases to 1.63-1.96 mm from the proximal end to the distal end.

[0015] Preferably, a third positioning mark is provided on the support tube, and the third positioning mark is annular or linear.

[0016] Preferably, the pathfinder catheter is at least a two-way connector structure, comprising a first pathfinder connector formed by its proximal end and a second pathfinder connector located on one side of the first pathfinder connector;

[0017] The second pathfinder joint is arranged tilted relative to the first pathfinder joint, with an included angle of 30 to 60 degrees.

[0018] More preferably, the distal end of the pathfinder catheter is a curved and pre-shaped elbow section, and the angle of the elbow section relative to its length direction is 3 to 5 degrees;

[0019] The pathfinder catheter has a length of 1.8 to 2.0 m, an outer diameter of 1.55 to 1.9 mm, and an inner diameter that can pass through a guide wire with a diameter of 0.38 mm.

[0020] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0021] The side-hole-free enteral nutrition pusher provided by the utility model can reduce the difficulty of operation, easily deliver the nutrition through the nasal cavity, help find the pylorus or output loop, reduce the difficulty of operating the nutrition tube and the discomfort caused to the patient by repeated friction of the nasal cavity during operation, and also play a good auxiliary role in passing through the narrow section of the intestine; and the nutrition tube with a side-hole-free structural design can be directly used as a nutrition delivery tube when the distal end reaches the jejunum, which is particularly suitable for pancreatitis patients who are comatose or unable to eat independently and need jejunal nutrition support. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of a straight-cylinder nutrition tube;

[0023] Figure 2 This is a schematic diagram of the main structure of a straight-cylinder nutrition tube;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of a straight-cylinder nutrition tube;

[0025] Figure 4 This is a schematic diagram of the top view of a straight-cylinder nutrient tube;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the nutrition tube with a two-way connector structure;

[0027] Figure 6 This is a schematic diagram of the main structure of the nutrition tube with a two-way connector structure;

[0028] Figure 7 This is a schematic diagram of the cross-sectional structure of the nutrition tube with a two-way connector structure;

[0029] Figure 8 This is a schematic diagram of the top view of the nutrition tube with a two-way connector structure;

[0030] Figure 9 Schematic diagram of the three-dimensional structure of the support tube;

[0031] Figure 10 Schematic diagram of the main structure of the support tube;

[0032] Figure 11 Schematic diagram of the cross-sectional structure of the support tube;

[0033] Figure 12 Schematic diagram of the top view of the support tube;

[0034] Figure 13 This is a schematic diagram of the three-dimensional structure of the pathfinder catheter;

[0035] Figure 14 This is a schematic diagram of the main structure of the pathfinder catheter;

[0036] Figure 15 This is a schematic diagram of the cross-sectional structure of the pathfinder catheter;

[0037] Figure 16 This is a schematic diagram of the top view of the pathfinder catheter. DETAILED DESCRIPTION

[0038] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative in nature and not to limit the present invention.

[0039] The following is a detailed and specific introduction to the present invention through specific embodiments to facilitate a better understanding of the present invention, but the following embodiments do not limit the scope of the present invention. In addition, when describing the orientation of the present invention, the direction closer to the operator during surgery is referred to as "near" and the direction farther away from the operator is referred to as "far".

[0040] The present invention provides a side-hole-free enteral nutrition pusher, which mainly consists of three parts: a nutrition tube 10, a support tube 20, and a pathfinding catheter 30. The nutrition tube 10 is used to be inserted through the nose to reach the gastric cavity. With the guidance of the support tube, the pathfinding catheter, and the guide wire, it is placed in the jejunum, providing support and nutrition delivery. The support tube 20 is used to be inserted through the nutrition tube 10 to reach the gastric cavity and then explore the pylorus or efferent loop. The pathfinding catheter 30 is used to be inserted through the support tube 20 to reach the pylorus and then enter the duodenum and advance to the jejunum.

[0041] The side-hole-free enteral nutrition pusher is designed for pancreatitis patients who are comatose or unable to eat independently and need jejunal nutrition support. A side-hole-free nutrition tube 10 is designed. The distal end of the nutrition tube 10 reaches the jejunum and can be directly used as a nutrition delivery tube.

[0042] The side-hole-free enteral nutrition pusher provided by the utility model can realize the one-time completion of guide wire exploration and nutrition tube placement for patients with different diseases, avoiding the risk of insufficient guide wire support and slippage, greatly reducing the difficulty and time of the operation, and eliminating the pain of repeated rubbing of the nasal cavity.

[0043] In addition, for the application scenarios corresponding to the nutrition tube 10 with this specific structural design, the utility model also provides a corresponding one-step placement method. This one-step method not only avoids the disadvantages of placement under gastroscopy, but also effectively solves the problem that the existing technology is not easy to adjust the guidewire catheter to the pylorus or output loop, and the difficulty of supporting the guidewire catheter in the gastric cavity segment, making it easier to deliver the nutrition tube to the distal end.

[0044] See also Figure 1 、 Figure 9 and Figure 13 As shown, this embodiment provides a side hole-free enteral nutrition pusher, which is a set structure consisting of a nutrition tube 10 that can be developed under X-ray fluoroscopy, a support tube 20 and a pathfinding catheter 30. The structure of the nutrition tube 10 is as shown in FIG. Figure 1 As shown, the structure of the support tube 20 is as follows Figure 9 As shown, and the structure of the pathfinder catheter 30 is as shown Figure 13 As shown, the feeding tube 10, the support tube 20 and the pathfinding catheter 30 all have a proximal end and a distal end.

[0045] The feeding tube 10 adopts a Type I design without side holes. During use, the distal end of the feeding tube 10 without side holes reaches the jejunum and can be used directly as a feeding tube. This feeding tube 10 without side holes is suitable for pancreatitis patients who are comatose or unable to eat independently and require jejunal nutritional support.

[0046] In this embodiment, if Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the feeding tube 10 is a hollow tubular structure with a proximal end and a distal end, and is used for insertion through the nose to reach the stomach cavity. The use of the feeding tube 10 avoids repeated friction on the nasopharyngeal tract during operation, plays a protective role, and also provides a certain degree of support.

[0047] In this embodiment, if Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the feeding tube 10 is straight and has a length of 1.3 to 2.0 meters, with a typical length of 1.3 to 1.5 meters. Depending on the location of intestinal stenosis, a 1.6 to 2 meter long feeding tube can be custom-made. The outer diameter of the feeding tube 10 is 4.35 to 5.33 mm, and the inner diameter is 3.0 to 4.05 mm. Preferably, the outer diameter of the feeding tube 10 is 4.65 to 5.0 mm, and the inner diameter is 3.2 to 3.85 mm.

[0048] As an implementation method, Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, the proximal end of the feeding tube 10 is a two-way connector structure, which includes a first sleeve connector 11 formed by the proximal end and a second sleeve connector 12 located on one side of the first sleeve connector 11. The first sleeve connector 11 is used to enter the feeding tube 40, and the second sleeve connector 12 is used to inject water or other liquids. The second sleeve connector 12 on the other side of the first sleeve connector 11 is an integrally formed structure.

[0049] In this embodiment, if Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the second sleeve joint 12 is arranged obliquely relative to the first sleeve joint 11, and the angle thereof is 30 to 60°; preferably, the angle thereof is 32 to 55°; further preferably, the angle thereof is 32 to 50°; more preferably, the angle thereof is 35 to 48°; more preferably, the angle thereof is 35 to 40°.

[0050] In this embodiment, the main body of the nutrition tube 10 and the second sleeve joint 12 on one side of the first sleeve joint 11 are an integral structure, and are made of one or both of polyurethane and polyimide materials. The polyurethane and polyimide used have the characteristics of soft material, good elasticity, and not easy to breed bacteria.

[0051] As an alternative technical solution, the material of the nutrition tube 10 can also be PEEK, nylon, polyurethane, polyethylene terephthalate (PET), HDHMWPE (high-density, high-molecular-weight polyethylene) or thermoplastic elastomer.

[0052] In addition, according to actual application needs, a protective layer can be coated on the surface of the nutrition tube 10. The protective layer is made of polytetrafluoroethylene coating. The polytetrafluoroethylene coating has an extremely low friction coefficient and is resistant to acids, alkalis, and various organic solvents. It reduces the resistance of the nutrition tube 10 in the intestine and ensures the stability of the product.

[0053] In this embodiment, a first positioning mark 13 is provided on the nutrition tube 10 at a position 80 to 90 cm away from the proximal end. The first positioning mark 13 is annular or linear.

[0054] In this embodiment, if Figure 9 、 Figure 10 、 Figure 11 and Figure 12 As shown, the support tube 20 is a hollow tubular structure with a proximal end and a distal end. Specifically, it has a proximal connector 21 and a distal exposed section 22. It is used for insertion through the feeding tube 10 to reach the gastric cavity and then explore the pylorus or the output tract. The use of the support tube 20 can help the surgeon quickly locate the output tract and provide support, reducing surgical difficulty and time.

[0055] The length of the support tube 20 is 1.6 to 1.8 meters, which is 20 to 30 cm longer than the length of the nutrition tube 10. Preferably, the length of the support tube 20 is 1.65 to 1.76 meters, which is 22 to 28 cm longer than the length of the nutrition tube 10. More preferably, the length of the support tube 20 is 1.68 to 1.75 meters, which is 23 to 27 cm longer than the length of the nutrition tube 10. Even more preferably, the length of the support tube 20 is 1.68 to 1.72 meters, which is 25 to 26 cm longer than the length of the nutrition tube 10. Specifically, the length of the support tube 20 is based on the length of the nutrition tube 10 and needs to exceed the length of the nutrition tube 10 by 20 to 30 cm. It can be lengthened if necessary.

[0056] The inner and outer diameters of the support tube 20 must correspond to the inner diameter of the feeding tube 10 and the outer diameter of the pathfinder catheter 30 to allow for free insertion of the support tube 20 and the pathfinder catheter 30. Specifically, the outer diameter of the support tube 20 is 2.6-4.0 mm, and the inner diameter of the support tube 20 that matches the inner diameter of the feeding tube 10 is 1.56-2.0 mm, for the purpose of passing a 5-6 French pathfinder catheter 30. Preferably, the outer diameter of the support tube 20 is 2.8-3.8 mm, and the inner diameter is 1.60-1.92 mm. More preferably, the outer diameter of the support tube 20 is 2.9-3.6 mm, and the inner diameter is 1.65-1.86 mm. Even more preferably, the outer diameter of the support tube 20 is 3.2-3.5 mm, and the inner diameter is 1.70-1.76 mm.

[0057] The distal end of the support tube 20 is a curved and pre-shaped exposed section 22, which has an angle of 25 to 90 degrees relative to its length direction. It adopts a large elbow structure design, which can guide and control the direction of the guidewire, making it easier to find the pylorus or output loop. The length of the exposed section 22 is 20 to 30 cm, and the diameter gradually decreases from the proximal end to the distal end. That is, the exposed section 22 at the distal end of the support tube 20 where it exits the nutrition tube 10 is designed with a tapered structure with a gradually decreasing diameter. The outer diameter of the exposed section 22 gradually decreases to 2.6 to 2.95 mm from the proximal end to the distal end. The inner diameter of the exposed section 22 gradually decreases to 1.63 to 1.96 mm from the proximal end to the distal end. That is, the inner and outer diameters of the exposed section 22 begin to tighten after exiting the nutrition tube 10, with the purpose of passing a 5 to 6F pathfinder catheter 30.

[0058] The support tube 20 is made of polytetrafluoroethylene, nylon 12, or other preferred polymer materials. Both the exposed section 22 and the support tube 20 are injection-molded polymer materials. The exposed section 22 serves to guide the stomach, increase permeability, and reduce intestinal wall damage. The polymer material of the exposed section 22 is designed to be lubricating and durable. The polymer material can be selected from one or more of ABS (ABS resin), PLA (polylactic acid), PVA (polyvinyl alcohol), PTFE (polytetrafluoroethylene), and Nylon (nylon). The support tube 20, made of a tough material, forms a cannula structure with the pathfinding catheter and guidewire, providing sufficient support in the gastric cavity, facilitating smoother placement of the feeding tube 10.

[0059] The support tube 20 is provided with a third positioning mark 23, which is either annular or linear. This third positioning mark 23 can be an annular marking ring, fitted over the distal end of the support tube 20, or a linear strip, embedded along the length of the support tube 20 at the distal end. Made of a platinum-iridium alloy, this third positioning mark 23 further clarifies the position of the distal end of the support tube 20 within the body.

[0060] In this embodiment, if Figure 13 、 Figure 14 、 Figure 15 and Figure 16 As shown, the entire body of the pathfinder catheter 30 can be visualized. It is a hollow tubular structure with a proximal end and a distal end. The pathfinder catheter 30 is inserted through the support tube 20, reaches the pylorus, and then enters the duodenum and advances to the jejunum. The use of the pathfinder catheter 30 can make it easier to pass the guidewire catheter through the narrow section of the intestine and better adapt to the multi-bend structure of the distal jejunum, allowing the guidewire to travel more smoothly and further through the multi-bend structure of the jejunum.

[0061] The pathfinder catheter 30 has a dual-way connector structure, comprising a first pathfinder connector 31 formed at its proximal end and a second pathfinder connector 32 located on either side of the first pathfinder connector 31. The first pathfinder connector 31 and the second pathfinder connector 32 are integrally formed. The first pathfinder connector 31 is used for guidewire insertion, while the second pathfinder connector 32 is used for contrast agent injection. The dual-lumen design of the pathfinder catheter 30 enables simultaneous pathfinder injection, eliminating the need to remove the guidewire before contrast agent injection, as with conventional catheters, making the procedure more convenient.

[0062] The second pathfinder joint 32 is arranged at an angle relative to the first pathfinder joint 31, and the angle thereof is 30 to 60°. Preferably, the angle thereof is 32 to 56° relative to the first pathfinder joint 31; more preferably, the angle thereof is 35 to 50° relative to the first pathfinder joint 31; more preferably, the angle thereof is 40 to 45° relative to the first pathfinder joint 31.

[0063] The distal end of the pathfinder catheter 30 is a curved and pre-shaped elbow section 33, and the angle of the elbow section 33 relative to its length direction is 3 to 5 degrees; preferably, the angle of the elbow section 33 relative to its length direction is 3.2 to 4.9 degrees; more preferably, the angle of the elbow section 33 relative to its length direction is 3.5 to 4.8 degrees; more preferably, the angle of the elbow section 33 relative to its length direction is 4.2 to 4.5 degrees.

[0064] The length of the pathfinder catheter 30 is based on the support tube 20, and the length needs to exceed the support tube by 20 to 30 cm. If necessary, it can be lengthened. Specifically, the pathfinder catheter 30 has a length of 1.8 to 2.0 m, an outer diameter of 1.55 to 1.9 mm, and an inner diameter that can pass through a guidewire with a diameter of 0.38 mm. Preferably, the pathfinder catheter 30 has a length of 1.85 to 1.96 m, an outer diameter of 1.60 to 1.85 mm, and an inner diameter that can pass through a guidewire with a diameter of 0.38 mm; more preferably, the pathfinder catheter 30 has a length of 1.88 to 1.95 m, an outer diameter of 1.65 to 1.80 mm, and an inner diameter that can pass through a guidewire with a diameter of 0.38 mm; more preferably, the pathfinder catheter 30 has a length of 1.90 to 1.93 m, an outer diameter of 1.72 to 1.80 mm, and an inner diameter that can pass through a guidewire with a diameter of 0.38 mm.

[0065] As needed, the pathfinder catheter 30 can be made of nylon 12 or other preferred polymer materials. It serves to guide the intestinal tract, improve permeability, and reduce intestinal wall damage. Furthermore, the polymer material used on the surface of the pathfinder catheter 30 is designed to be lubricating and durable, and may be made from one or more of ABS (ABS resin), PLA (polylactic acid), PVA (polyvinyl alcohol), PTFE (polytetrafluoroethylene), and Nylon.

[0066] As a specific application of the enteral nutrition delivery device without side holes in this embodiment, it is targeted at pancreatitis patients who are comatose or unable to eat independently and require jejunal nutritional support. The nutrition tube 10 adopts an I-type structure without side holes, a straight-tube or double-lumen connector with a proximal single-lumen connector, and can be used directly as a nutrition tube by reaching the jejunum at the distal end.

[0067] The enteral nutrition delivery device without side holes, which has an I-type structure nutrition tube 10 without side holes, a support tube 20 and a pathfinding catheter 30, has an enteral nutrition delivery method when used, specifically comprising the following steps:

[0068] Step 1: insert the feeding tube 10 through the nose to reach the gastric cavity and prevent it from slipping;

[0069] Step 2: insert the support tube 20 through the feeding tube 10, and explore the pylorus or efferent loop after reaching the gastric cavity;

[0070] Step 3: insert the pathfinding catheter 30 and the guide wire therein through the support tube 20, find the pylorus position, and then enter the duodenum and advance to the jejunum;

[0071] Step 4, then controlling the feeding tube 10 and the support tube 20 to follow the pathfinding catheter 30 to the jejunum position;

[0072] Step 5: retain the feeding tube 10 and sequentially remove the guide wire, support tube 20 and pathfinding catheter 30;

[0073] Step 6: Fix the nutrition tube 10 and deliver nutrition through the nutrition tube 10;

[0074] Step 7: After the nutrition delivery is completed, the nutrition tube 10 is flushed with drinking water.

[0075] This side-hole-free enteral nutrition pusher allows for simultaneous guidewire exploration and tube placement, eliminating the risk of insufficient guidewire support and slippage, significantly reducing surgical difficulty and time, and eliminating the painful experience of repeated nasal rubbing. Furthermore, the pusher's one-step placement method eliminates the drawbacks of endoscopic placement while effectively addressing the existing difficulties in adjusting the guidewire to the pylorus or efferent loop, as well as the difficulty in supporting the guidewire in the gastric cavity, making distal delivery of the nutrition tube easier.

[0076] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0077] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0078] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A side-hole-free enteral nutrition pusher, characterized in that: The invention comprises a nutrition tube (10), a support tube (20) and a pathfinding catheter (30) which are arranged in sequence from the inside to the outside, wherein: the support tube (20) is movably arranged in the nutrition tube (10) to reach the gastric cavity position and then explore the pylorus or output loop; the pathfinding catheter (30) is movably arranged in the support tube (20) to reach the pylorus position and then enter the duodenum and move to the jejunum position.

2. The enteral nutrition pusher without side holes according to claim 1, characterized in that: The nutrition tube (10) is a straight tube with a length of 1.3 to 2.0 m, an outer diameter of 4.35 to 5.33 mm, and an inner diameter of 3.0 to 4.05 mm.

3. The enteral nutrition pusher without side holes according to claim 1, characterized in that: The proximal end of the nutrition tube (10) is a two-way joint structure, comprising a first sleeve joint (11) formed by the proximal end thereof and a second sleeve joint (12) located on one side of the first sleeve joint (11); The second sleeve joint (12) is arranged obliquely relative to the first sleeve joint (11), with an included angle of 30 to 60 degrees.

4. The enteral nutrition pusher without side holes according to claim 1, characterized in that: A first positioning mark (13) is provided on the nutrition tube (10) at a position 80 to 90 cm from the proximal end. The first positioning mark (13) is annular or linear.

5. The enteral nutrition pusher without side holes according to claim 1, characterized in that: The support tube (20) has a length of 1.6 to 1.8 m, which is 20 to 30 cm longer than the length of the nutrition tube (10), and an outer diameter of 2.6 to 4.0 mm and an inner diameter of 1.56 to 2.0 mm.

6. The enteral nutrition pusher without side holes according to claim 5, characterized in that: The distal end of the support tube (20) is a curved and pre-shaped exposed section (22), with an angle of 25 to 90 degrees relative to its length direction.

7. The enteral nutrition pusher without side holes according to claim 6, characterized in that: The length of the exposed section (22) is 20 to 30 cm, and the diameter thereof gradually decreases from the proximal end to the distal end; The outer diameter of the exposed section (22) gradually decreases to 2.6-2.95 mm from the proximal end to the distal end; and the inner diameter of the exposed section (22) gradually decreases to 1.63-1.96 mm from the proximal end to the distal end.

8. The enteral nutrition pusher without side holes according to claim 1, characterized in that: The support tube (20) is provided with a third positioning mark (23), and the third positioning mark (23) is annular or linear.

9. The enteral nutrition pusher without side holes according to claim 1, characterized in that: The pathfinding catheter (30) is at least a two-way joint structure, comprising a first pathfinding joint (31) formed by its proximal end and a second pathfinding joint (32) located on one side of the first pathfinding joint (31); The second pathfinding joint (32) is arranged obliquely relative to the first pathfinding joint (31), and the angle thereof is 30 to 60 degrees.

10. The enteral nutrition pusher without side holes according to claim 9, characterized in that: The distal end of the pathfinder catheter (30) is a curved and pre-shaped elbow section (33), and the angle of the elbow section (33) relative to its length direction is 3 to 5 degrees; The pathfinder catheter (30) has a length of 1.8 to 2.0 m, an outer diameter of 1.55 to 1.9 mm, and an inner diameter capable of passing a guide wire with a diameter of 0.38 mm.

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