Flexible thin pharyngoscope insertion tube combined framework

Abstract

The utility model relates to a flexible thin type pharyngoscope insertion tube combined skeleton, which comprises a bourdon tube, a woven mesh tube and a front connecting ring, the woven mesh tube is sleeved on the periphery of the bourdon tube, two ends of the woven mesh tube are connected with two ends of the bourdon tube into a whole, the bourdon tube comprises a throat section, a nasal cavity or oral cavity section and a handheld section which are sequentially connected into a whole, and the front connecting ring is connected with the front connecting ring. The front connecting ring is characterized in that the front connecting ring comprises an inner ring and an annular table arranged on the periphery of the inner ring, part of the inner ring is inserted into an inner hole of the throat section of the spring tube, the annular table is located on the outer side of the end of the throat section and connected with the spring tube into a whole, and a through traction spring tube positioning groove is formed in the inner ring in the length direction of the inner ring. According to the utility model, high-precision positioning connection with a traction spring tube can be realized subsequently, the internal space is enlarged, and a minimally invasive surgical instrument with a larger specification can enter an inner hole of a thin skeleton.

Description

Technical Field

[0001] This utility model relates to an insertion tube assembly frame, specifically to a flexible, thin laryngoscope insertion tube assembly frame. Background Technology

[0002] Flexible laryngoscopes are widely used for the diagnosis of upper respiratory tract diseases, and for minimally invasive surgery or treatment of related diseases in the nasal cavity, nasopharynx, and pharynx. The insertion tube of the flexible laryngoscope is inserted into the nasal cavity, nasopharynx, pharynx, and all the way to the glottis of the upper respiratory tract for examination, diagnosis, or some minimally invasive surgical treatments. In current technology, laryngoscopes can be inserted through the nasal cavity or oral cavity. Due to the location of use, the overall size is very small. For pediatric laryngoscopes, the overall size is even smaller, and the inner diameter is even smaller. This makes it difficult for standard-sized minimally invasive surgical instruments to enter the inner hole of such a small laryngoscope. Further explanation of the usage scenarios for pediatric laryngoscopes is needed.

[0003] 1. Children often suffer from nasopharyngeal diseases such as rhinitis, pharyngitis, and nosebleeds; and they frequently experience foreign objects stuck in their nasal cavity or throat, or fish bones or small bone spurs stuck in their throat; therefore, there is a market need to develop a thin, flexible endoscope. This utility model is particularly suitable for and meets the needs of diagnosis and treatment of children's throat diseases.

[0004] 2. Furthermore, the insertion tube of the thin flexible laryngoscope is one of the most critical components of this medical flexible endoscope. Also, because children's pharyngeal and laryngeal cavities are much smaller than those of adults, the design and production of thin laryngoscopes is more difficult. Therefore, it is necessary to design and develop an insertion tube for a thin flexible endoscope that will not damage the pharyngeal and laryngeal cavities of children.

[0005] Currently, the existing flexible laryngoscope insertion tube assembly includes a spring tube and a braided mesh tube disposed around the outer periphery of the spring tube, and a front connecting ring is also provided in the inner hole at one end of the spring tube.

[0006] However, the disadvantages of the above-mentioned combined skeleton structure are as follows: First, since the front connecting ring is a single ring structure and is set in the inner hole of the spring tube, when the traction spring tube is assembled later, the traction spring tube is directly welded to the inner wall of the hole of the front connecting ring. This results in low positioning accuracy and angular deviation defects after welding. This is because the position of the traction spring tube will deviate after welding the front connecting ring and will not be coaxial with the traction steel rope of the curved snake bone assembly connected to the front connecting ring. When the traction steel rope pulls the bend angle, the greater the deviation of the traction steel rope, the greater the friction. With more pulling and friction, the steel rope will break due to excessive friction, and the bending function of the endoscope cannot be used normally. In severe cases, medical accidents may occur.

[0007] Second, the welding of the outer diameter of the traction spring tube to the hole wall of the front connecting ring not only results in a small contact welding area, but also low welding strength.

[0008] Third, in existing technologies, the outer diameter of the traction spring tube is directly welded to the inner wall of the front connector. Since the traction spring tube is cylindrical, it occupies part of the space in the inner hole of the front connector. This makes it more crowded when assembling the endoscope and inserting the inserted objects into the tube hole. If some larger minimally invasive surgical instruments (forceps, biopsy forceps, etc.) are inserted, it may even be impossible to enter. Summary of the Invention

[0009] The purpose of this invention is to provide a flexible, thin laryngoscope insertion tube assembly frame that can achieve high-precision positioning connection with the subsequent traction spring tube, and to increase the internal space so that larger minimally invasive surgical instruments can enter the small-diameter inner hole.

[0010] To achieve the above objectives, the technical solution of this utility model is: a flexible, thin laryngoscope insertion tube assembly frame, comprising a spring tube, a braided mesh tube, a front connecting ring, and a polyurethane protective tube. The braided mesh tube is fitted around the outer periphery of the spring tube, and both ends of the braided mesh tube are integrally connected to both ends of the spring tube. The spring tube comprises a pharyngeal segment, a nasal or oral segment, and a handheld segment sequentially connected as a single unit. Its innovation lies in:

[0011] The front connecting ring includes an inner ring and an annular platform disposed on the outer periphery of the inner ring. A portion of the inner ring is inserted into the inner hole of the pharyngeal segment of the spring tube. The annular platform is located on the outer side of the end of the pharyngeal segment and is integrated with the spring tube. A traction spring tube positioning groove is provided on the inner ring along its length.

[0012] In the above technical solution, the spring pitch P1 of the pharyngeal segment and the spring pitch P2 of the nasal or oral segment are equal, and the spring pitch P2 of the nasal or oral segment is smaller than the spring pitch P3 of the handheld segment.

[0013] The braided mesh tube includes a front mesh tube and a rear mesh tube woven together as one piece. The front mesh tube is located on the outer periphery of the pharyngeal segment, and the rear mesh tube is located on the outer periphery of the nasal cavity or oral cavity segment and the hand-held segment. The outer periphery of the rear mesh tube is provided with a polyurethane protective tube, and the length of the polyurethane protective tube is less than the length of the rear mesh tube, so that the tail of the rear mesh tube is exposed outside the polyurethane protective tube for assembly and connection with the rear fixing seat.

[0014] In the above technical solution, the inner ring of the front connector is provided with a pair of symmetrically arranged snake-bone connecting holes, or the inner ring of the front connector is provided with three equally arranged snake-bone connecting holes along its circumference.

[0015] In the above technical solution, the pores of the braided mesh tube on the outer periphery of the handheld section are coated with polyurethane coating.

[0016] In the above technical solution, the annular platform is located in the middle part of the inner ring along its length, and the inner ring is provided with two symmetrically arranged traction spring tube positioning grooves along its length.

[0017] In the above technical solution, two traction spring tube positioning grooves are provided on the inner ring along its length, and the axes of the two traction spring tube positioning grooves are offset from the central axis of the inner ring by 4° to 6°.

[0018] In the above technical solution, the outer diameter of the inner ring is equal to the inner diameter of the spring tube, and the outer diameter of the annular platform is equal to the outer diameter of the braided mesh tube.

[0019] In the above technical solution, the spring pitch P1 of the pharyngeal segment and the spring pitch P2 of the nasal or oral segment are both 1.7mm to 2.2mm, and the spring pitch P3 of the hand-held segment is 2.2mm to 2.8mm.

[0020] In the above technical solution, the total length L of the spring tube is 450mm to 540mm, the length L1 of the pharyngeal segment is 75mm to 90mm, the length L2 of the nasal or oral segment is 225mm to 270mm, the length L3 of the handheld segment is 150mm to 180mm, and the inner diameter of the spring tube is Φ2.4mm to Φ3.0mm.

[0021] In the above technical solution, the Shore hardness of the polyurethane protective tube is 46A to 50A.

[0022] The positive effects of this utility model are as follows: After adopting the flexible thin laryngoscope insertion tube assembly frame of this utility model, since the anterior connecting ring of this utility model includes an inner ring and an annular platform provided on the outer periphery of the inner ring, and a portion of the inner ring is inserted into the inner hole of the pharyngeal segment of the spring tube, the annular platform is located on the outer side of the end of the pharyngeal segment and is integrated with the spring tube, and a through traction spring tube positioning groove is provided on the inner ring along its length direction.

[0023] The advantages of this design are as follows: First, it can further increase the space of the insertion tube aperture. When assembling the traction spring tube later, the traction spring tube can be welded tightly to the bottom of the traction spring tube positioning groove on the inner ring, so that the outer diameter of the traction spring tube is tightly attached to the annular platform hole of the largest outer diameter of the front connecting ring, without occupying the internal space of the inner ring. This greatly increases the space of the insertion tube, overcoming the problem that the traction spring tube is attached to the inner wall of the front connecting ring in the existing technology, which would occupy the internal space. Also, since this utility model is the insertion tube of a fine-diameter laryngoscope, when the insertion tube aperture space is increased, it is easier to assemble the internal contents of the insertion tube such as the forceps tube with a larger diameter, providing sufficient space for the subsequent assembly of other internal contents.

[0024] Secondly, it improves welding strength: Because the outer diameter of the traction spring tube fits tightly within the positioning groove during subsequent assembly, it not only increases the contact area during welding but also results in a strong welded connection, making it less prone to detachment.

[0025] Third, welding is more convenient and efficient during assembly and production: because the outer diameter openings at both ends of the traction spring tube positioning groove can be welded to the contact parts of the traction spring tube, welding is very convenient during production and assembly.

[0026] Fourth, it boasts high positioning accuracy. Because the inner ring of the front connector has a traction spring tube positioning groove, the traction spring tube directly engages with this groove before welding. This overcomes the drawback of blind welding the traction spring tube to the approximate position of the front connector in existing technologies, ensuring that the relative position of the traction spring tube and the front connector will not deviate. It should be further noted that because the traction spring tube contains a traction steel cable connected to the bend of the insertion tube, this ensures that the orientation of the upright image captured by the camera at the very front of the insertion section is consistent. When the traction steel cable is pulled, there will be no excessive friction due to misalignment. This ensures that the bends of the insertion tube in different directions are precisely bends on a 180° plane, further improving the comfort of subsequent bend operations and providing better results for doctors. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of one specific embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the front connector ring of this utility model;

[0029] Figure 3 yes Figure 2 Side view;

[0030] Figure 4 This is a schematic diagram of the structure of the spring tube of this utility model. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but it is not limited thereto.

[0032] like Figure 1 , 2 As shown in Figures 3 and 4, a flexible, thin laryngoscope insertion tube assembly includes a spring tube 1, a braided mesh tube 2, and a front connecting ring 3. The braided mesh tube 2 is fitted around the outer periphery of the spring tube 1, and both ends of the braided mesh tube 2 are integrally connected to both ends of the spring tube 1. The spring tube 1 includes a pharyngeal segment 11, a nasal or oral segment 12, and a handheld segment 13, which are sequentially connected as one unit.

[0033] The front connecting ring 3 includes an inner ring 31 and an annular platform 32 disposed on the outer periphery of the inner ring 31. A portion of the inner ring 31 is inserted into the inner hole of the throat section 11 of the spring tube 1. The annular platform 32 is located on the outer side of the end of the throat section 11 and is integrated with the spring tube 1. A traction spring tube positioning groove 33 is provided on the inner ring 31 along its length direction.

[0034] Because the existing technology divides the insertion tube skeleton into two sections with different stiffness, that is, the latter half of the second section of the skeleton does not enter the human body. This section has the same stiffness as the first half of the second section. The disadvantage of the hand-held section when the doctor operates the endoscope is that the stiffness is not enough. When inserting by hand, the middle section sometimes bends automatically, which is not conducive to insertion and makes insertion a little difficult. The doctor's instability when holding the rear section of the insertion tube (skeleton) is also caused by insufficient stiffness, which sometimes makes the operation difficult.

[0035] To solve the above problems, the insertion tube of this utility model is divided into three sections with different hardness, and the specific structural implementation is as follows:

[0036] like Figure 4 As shown, the spring pitch P1 of the pharyngeal segment 11 and the spring pitch P2 of the nasal or oral segment 12 are equal, and the spring pitch P2 of the nasal or oral segment 12 is smaller than the spring pitch P3 of the hand-held segment 13.

[0037] The braided mesh tube 2 includes a front mesh tube 21 and a rear mesh tube 22 woven together. The front mesh tube 21 is located on the outer periphery of the pharyngeal segment 11, and the rear mesh tube 22 is located on the outer periphery of the nasal cavity or oral cavity segment 12 and the hand-held segment 13. The outer periphery of the rear mesh tube 22 is provided with a polyurethane protective tube 4, and the length of the polyurethane protective tube 4 is less than the length of the rear mesh tube 22, so that the tail of the rear mesh tube 22 is exposed outside the polyurethane protective tube 4 for assembly and connection with the rear fixing seat.

[0038] Therefore, the spring tube of this utility model is divided into two sections with different hardness: the pharyngeal section and the nasal or oral cavity section have the same hardness, and the pharyngeal section is more flexible than the hand-held section. Furthermore, because the outer periphery of the rear mesh tube is provided with a polyurethane protective tube, the insertion tube assembly skeleton forms three sections with different hardness.

[0039] Thus, the inserter frame of this utility model has the following structure: the first section, from front to back, is inserted into the pharynx, that is, deep into the pharynx; the second section is the nasal or oral cavity section (for thin inserters, the tube enters the pharynx or part of the esophagus from the oral cavity to catch foreign objects such as fish bones), or it can be inserted into the pharynx through the nostril; the third section is the operator's holding part, which facilitates better insertion of the first two sections. When the laryngoscope is inserted into the pharyngeal cavity for examination and diagnosis, the rear section is the operator's holding part. This improvement does not affect the flexibility of the front part of the inserter, avoids the automatic bending caused by the relatively soft middle section, and is more conducive to insertion. It ensures the stability of the insertion of the nasal or oral cavity section and the holding part, improves the insertability of the laryngoscope, facilitates the doctor's operation, shortens the time for insertion, examination, and diagnosis of related diseases of the pharynx, and reduces patient discomfort.

[0040] Furthermore, such as Figure 3 As shown, in order to facilitate the positioning connection with the curved snake bone of the insertion tube, and also to position the camera in the correct direction and orientation during the use and diagnosis of the medical electronic endoscope, that is, to maintain an upright image and improve the quality of operation, inspection and diagnosis, the inner ring 31 of the front connecting ring 3 is provided with a pair of snake bone connecting holes 34 symmetrically arranged thereal. Of course, three equally spaced snake bone connecting holes 34 can also be provided on the inner ring 31 of the front connecting ring 3 along its circumference.

[0041] In the prior art, the outer circumferential surface of the braided mesh tube is provided with a plastic coating layer formed by curing polyurethane coating, and then a polyurethane protective tube is fitted on the outer circumference of the braided mesh tube. This not only increases the overall outer diameter of the insertion tube, but also excessively increases the hardness, which is not conducive to the insertion operation. In order to further enhance the hardness of the hand-held section without increasing the outer diameter, the pores of the braided mesh tube 2 on the outer circumference of the hand-held section 13 of the spring tube 1 of this utility model are coated with polyurethane coating.

[0042] Specifically, the braided mesh tube 2 is made of steel wire. Liquid polyurethane coating is impregnated only in the pores of the braided mesh tube around the outer periphery of the handheld section 13, and is located in a star-shaped pattern in the pores of the outer diameter of the braided mesh tube. At the same time, the maximum outer diameter of the steel wire is not coated with plastic. This not only increases the bending rigidity of this section, but also does not increase the outer diameter of the skeleton, and also increases the insertion force of the insertion tube. In other words, the plastic coating increases the insertion force of the handheld section, making it more convenient for doctors to operate and use.

[0043] Furthermore, such as Figure 3 As shown, in order to achieve subsequent positioning and assembly with the traction spring tube, the annular platform 32 is located in the middle part of the inner ring 31 along its length direction, and the inner ring 31 is provided with two symmetrically arranged traction spring tube positioning grooves 33.

[0044] Furthermore, such as Figure 3As shown, the inner ring 31 has two traction spring tube positioning grooves 33 along its length, and the axes of the two traction spring tube positioning grooves 33 are offset from the central axis of the inner ring 31 by 4° to 6°. This divides the internal space of the inner ring 31 into two sides of approximately 190° and 170° respectively. Alternatively, four equally divided traction spring tube positioning grooves can be designed along the circumference of the inner ring 31.

[0045] The advantages of this design are as follows: Advantage 1: It increases the space of the insertion tube aperture, which is conducive to assembling the largest forceps tube of the pediatric laryngoscope, and allows the entry of larger minimally invasive surgical instruments, such as large biopsy forceps, for minimally invasive surgery; Advantage 2: It can assemble and produce a fine endoscope with a four-way serpentine bend, giving it a wide field of view; Advantage 3: The traction spring tube is soldered to the slot on the outer diameter of the front connecting ring, so that the long slot and the outer diameter of the traction spring tube assembled in the slot are filled with solder, resulting in higher welding strength and allowing for direct inspection of the welding effect (the existing technology has a disadvantage that the outer diameter of this positioning slot structure is not open, and soldering is performed in this hole, making it almost impossible to see the welding effect, etc.).

[0046] Advantage 4: Standard-sized forceps tubes for laryngoscopes can now be installed even inside thin insertion tubes. The angle offset of the traction spring tube positioning groove in this invention corresponds to the angle offset of the traction wire rope of the curved snake-like part of the endoscope, i.e., a synchronous offset angle. This means that the angular position of the traction spring tube and the angular position of the traction wire rope of the curved snake-like part are on the same concentric axis, but this does not affect the bend angle of the curved snake-like part of the endoscope. Because the connecting shafts of the two sets (two rows) of the curved snake-like part are still designed at a symmetrical 180-degree position, the directional position after bending in both directions remains unchanged, still in a 180-degree plane position, and is not affected when operating the bend angle.

[0047] Furthermore, such as Figure 1 As shown, in order to make the structure more reasonable and without increasing the outer diameter, the outer diameter of the inner ring 31 is equal to the inner diameter of the spring tube 1, and the outer diameter of the annular platform 32 is equal to the outer diameter of the braided mesh tube 2.

[0048] Furthermore, such as Figure 4 As shown, in order to further improve the rationality of the structure, the spring pitch P1 of the pharyngeal segment 11 and the spring pitch P2 of the nasal or oral segment 12 are both 1.7mm to 2.2mm, and the spring pitch P3 of the hand-held segment 13 is 2.2mm to 2.8mm.

[0049] Furthermore, the total length L of the spring tube 1 is 450mm to 540mm, the length L1 of the pharyngeal segment 11 is 75mm to 90mm, the length L2 of the nasal or oral segment 12 is 225mm to 270mm, the length L3 of the handheld segment 13 is 150mm to 180mm, and the inner diameter of the spring tube 1 is Φ2.4mm to Φ3.0mm.

[0050] Furthermore, in order to ensure that the flexibility of the section with the polyurethane protective sleeve at the rear of the insertion tube meets the technical requirements, the Shore hardness of the polyurethane protective sleeve 4 is 46A to 50A.

[0051] In summary, the advantages of this utility model are:

[0052] (1) Structural improvements to the front connector:

[0053] First, it offers the advantage of further increasing the insertion tube's aperture space: During subsequent assembly of the traction spring tube, the traction spring tube can be welded tightly against the bottom of the traction spring tube positioning groove on the inner ring, ensuring that the outer diameter of the traction spring tube is flush with the annular platform hole of the largest outer diameter of the front connector ring. This significantly increases the space available for the insertion tube, overcoming the problem in existing technologies where the traction spring tube is entirely attached to the inner wall of the single-ring front connector ring, thus occupying internal space. Furthermore, since this invention uses the insertion tube for a small-diameter laryngoscope, the increased aperture space facilitates the assembly of larger-diameter forceps tubes and other internal components within the insertion tube, providing sufficient space for the subsequent assembly of other internal components.

[0054] Secondly, it improves welding strength: Because the outer diameter of the traction spring tube fits tightly within the positioning groove during subsequent assembly, it not only increases the contact area during welding but also results in a strong welded connection, making it less prone to detachment.

[0055] Third, welding is more convenient and efficient during assembly: because the outer diameter openings at both ends of the traction spring tube positioning groove can be welded to the contact parts of the traction spring tube, welding is very convenient during production and assembly.

[0056] Fourth, it boasts high positioning accuracy. Because the inner ring of the front connector has a traction spring tube positioning groove, the traction spring tube directly engages with this groove before welding. This overcomes the drawback of blind welding the traction spring tube to the approximate position of the front connector in existing technologies, ensuring that the relative position of the traction spring tube and the front connector will not deviate. It should be further noted that because the traction spring tube contains a traction steel cable connected to the bend of the insertion tube, this ensures that the orientation of the upright image captured by the camera at the very front of the insertion section is consistent. When the traction steel cable is pulled, there will be no excessive friction due to misalignment. This ensures that the bends of the insertion tube in different directions are precisely bends on a 180° plane, further improving the comfort of subsequent bend operations and providing better results for doctors.

[0057] (2) Improvements to the overall skeleton, which consists of three sections with different levels of hardness:

[0058] This utility model's spring tube is divided into two sections with different hardness: the pharyngeal section and the nasal or oral cavity section have the same hardness, with the pharyngeal section being more flexible than the handheld section. Furthermore, the outer periphery of the rear section's mesh tube is protected by a polyurethane sheath. This, combined with the polyurethane sheath, creates a three-section structure with varying hardness. When the laryngoscope is inserted into the pharyngeal cavity for examination and diagnosis, the rear section serves as the operator's handheld section. This improvement, without affecting the flexibility of the front section of the insertion tube, avoids automatic bending of the relatively soft middle section, making insertion easier. It ensures the stability of insertion into the nasal or oral cavity section and the handheld section, improving the laryngoscope's insertability, facilitating doctor's operation, shortening the time for insertion, examination, and diagnosis of related pharyngeal diseases, and reducing patient discomfort.

[0059] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A flexible, thin laryngoscope insertion tube assembly frame, comprising a spring tube (1), a braided mesh tube (2), and a front connecting ring (3), wherein the braided mesh tube (2) is fitted around the outer periphery of the spring tube (1), and the two ends of the braided mesh tube (2) are integrally connected to the two ends of the spring tube (1), wherein the spring tube (1) comprises a pharyngeal segment (11), a nasal or oral segment (12), and a handheld segment (13) sequentially connected as one unit. Its features are: The front connecting ring (3) includes an inner ring (31) and an annular platform (32) disposed on the outer periphery of the inner ring (31). A portion of the inner ring (31) is inserted into the inner hole of the throat section (11) of the spring tube (1). The annular platform (32) is located outside the end of the throat section (11) and is integrated with the spring tube (1). A through traction spring tube positioning groove (33) is provided on the inner ring (31) along its length.

2. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1, characterized in that: The spring pitch P1 of the pharyngeal segment (11) and the spring pitch P2 of the nasal or oral segment (12) are equal, and the spring pitch P2 of the nasal or oral segment (12) is smaller than the spring pitch P3 of the handheld segment (13). The braided mesh tube (2) includes a front mesh tube (21) and a rear mesh tube (22) woven together. The front mesh tube (21) is located on the periphery of the pharyngeal segment (11), and the rear mesh tube (22) is located on the periphery of the nasal cavity or oral cavity segment (12) and the hand-held segment (13). The rear mesh tube (22) is provided with a polyurethane protective tube (4) on its periphery, and the length of the polyurethane protective tube (4) is less than the length of the rear mesh tube (22), so that the tail of the rear mesh tube (22) is exposed outside the polyurethane protective tube (4) for assembly and connection with the rear fixing seat.

3. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1, characterized in that: The inner ring (31) of the front connector ring (3) is provided with a pair of symmetrically arranged snake-bone connecting holes (34), or the inner ring (31) of the front connector ring (3) is provided with three equally arranged snake-bone connecting holes (34) along its circumference.

4. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1 or 2, characterized in that: The pores of the braided mesh tube on the outer periphery of the handheld section (13) of the spring tube (1) are coated with polyurethane coating.

5. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1, characterized in that: The annular platform (32) is located in the middle part of the inner ring (31) along its length direction, and the inner ring (31) is provided with two symmetrically arranged traction spring tube positioning grooves (33).

6. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1, characterized in that: The inner ring (31) is provided with two traction spring tube positioning grooves (33) along its length, and the axes of the two traction spring tube positioning grooves (33) are offset from the central axis of the inner ring (31) by 4° to 6°.

7. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1, characterized in that: The outer diameter of the inner ring (31) is equal to the inner diameter of the spring tube (1), and the outer diameter of the annular platform (32) is equal to the outer diameter of the braided mesh tube (2).

8. The flexible, thin laryngoscope insertion tube assembly frame according to claim 2, characterized in that: The spring pitch P1 of the pharyngeal segment (11) and the spring pitch P2 of the nasal or oral segment (12) are both 1.7mm to 2.2mm, and the spring pitch P3 of the handheld segment (13) is 2.2mm to 2.8mm.

9. The flexible, thin laryngoscope insertion tube assembly frame according to claim 1, characterized in that: The total length L of the spring tube (1) is 450mm to 540mm, the length L1 of the pharyngeal segment (11) is 75mm to 90mm, the length L2 of the nasal or oral segment (12) is 225mm to 270mm, the length L3 of the handheld segment (13) is 150mm to 180mm, and the inner diameter of the spring tube (1) is Φ2.4mm to Φ3.0mm.

10. The flexible, thin laryngoscope insertion tube assembly frame according to claim 2, characterized in that: The Shore hardness of the polyurethane protective tube (4) is 46A to 50A.

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