Insertion tube of medical flexible thin pharyngoscope

Abstract

The utility model relates to an insert tube of medical flexible thin type pharyngoscope, including bourdon tube, woven mesh tube, front connecting ring, polyurethane protective tube, rear connecting ring and traction bourdon tube, woven mesh tube is sleeved at the periphery of bourdon tube, rear connecting ring is sleeved at the periphery of woven mesh tube tail, traction bourdon tube is provided in bourdon tube, the polyurethane protective tube is provided with the polyurethane protective tube, the polyurethane protective tube is provided with the polyurethane protective tube, the polyurethane protective tube is provided with the polyurethane protective tube, and the polyurethane protective tube is provided with the polyurethane protective tube. The front connecting ring is characterized in that the front connecting ring comprises an inner ring body and an annular table arranged on the periphery of the inner ring body, part of the inner ring body 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 a penetrating traction spring tube positioning groove is formed in the inner ring body. The head of the traction spring pipe is embedded in the traction spring pipe positioning groove, the polyurethane protection pipe is arranged on the periphery of part of the woven mesh pipe in a sleeving mode, and the other end of the polyurethane protection pipe is adjacent to the rear connecting ring. According to the utility model, high-precision positioning connection between parts is realized, the internal space is enlarged, and minimally invasive surgical instruments with larger specifications can enter and be inserted more powerfully and smoothly.

Description

Technical Field

[0001] This utility model relates to an insertion tube, specifically to an insertion tube for a medical flexible thin laryngoscope. 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 larynx. The insertion tube of the flexible laryngoscope is inserted into the nasal cavity, nasopharynx, larynx, 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, making it difficult to insert standard-sized minimally invasive surgical instruments. The application scenarios of pediatric laryngoscopes will be further elaborated below.

[0003] 1. Due to the high prevalence of nasopharyngeal diseases such as rhinitis, pharyngitis, and nosebleeds in children, and the frequent occurrence of foreign objects lodged in the nasal cavity or throat, or fish bones or small bone spurs lodged in the throat, there is a market demand for the development of a thin, flexible endoscope. This utility model is particularly suitable for and meets the needs of diagnosis and treatment of throat diseases in children.

[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 flexible laryngoscope insertion tube in the prior art includes a spring tube, a braided mesh tube, a front connecting ring, and a traction spring tube. The braided mesh tube is located on the outer periphery of the spring tube, and a front connecting ring is also provided in the inner hole of one end of the spring tube. The traction spring tube is directly welded to the inner wall of the front connecting ring.

[0006] However, the above-mentioned insertion tube structure has the following disadvantages: First, since the front connecting ring is a single ring structure and is set in the inner hole of the spring tube as a whole, and 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 the traction spring tube is welded. This is because the position of the traction spring tube will deviate after welding on the front connecting ring, and the traction steel rope of the curved snake bone assembly connected to the front connecting ring is not coaxial. This causes the steel rope of the traction bend on the snake bone to be not coaxial with the traction spring tube. When the steel rope pulls the bend, the greater the deviation of the steel rope, the greater the friction. With more pulling and friction, the steel rope will break due to excessive friction, causing the bending function of the endoscope to not work properly, and in severe cases, medical accidents may occur.

[0007] Secondly, the welding of the outer diameter of the traction spring tube to the hole wall of the front connecting ring not only has a small contact welding area, but also low welding strength, making it prone to falling off.

[0008] Third, since the outer diameter of the traction spring is directly welded to the inner wall of the front connector, and the traction spring tube is cylindrical in shape, it will occupy part of the space in the inner hole of the front connector. This will make it more crowded when assembling the endoscope insertion tube hole. If it is a large minimally invasive surgical instrument (forceps tube, biopsy forceps, etc.), it may even be impossible to enter.

[0009] Fourth, because existing technologies have polyurethane protective tubes of equal length wrapped around the braided mesh tube, the front part of the insertion tube is not soft enough and the rear part is not hard enough. When the doctor inserts it by hand, the front part (pharyngeal segment) which is not soft enough will cause discomfort when inserted into the patient's body, and the rear part (hand-held segment) will be unstable and the insertion force will be insufficient, making the operation difficult. Summary of the Invention

[0010] The purpose of this invention is to provide an insertion tube that not only achieves high-precision positioning and connection between the insertion skeleton and the traction spring tube, but also increases the internal space, allowing larger minimally invasive surgical instruments to enter the inner hole of the thin skeleton, and enabling more powerful and smooth insertion of a flexible, thin medical laryngoscope.

[0011] To achieve the above objectives, the technical solution of this utility model is: an insertion tube for a medical flexible thin laryngoscope, comprising a spring tube, a braided mesh tube, a front connecting ring, a polyurethane protective tube, a rear connecting ring, and a traction spring 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 rear connecting ring is fitted around the outer periphery of the tail of the braided mesh tube. The traction spring tube is disposed within the spring tube, with its tail located outside the rear connecting ring. The spring tube comprises a pharyngeal segment, a nasal or oral segment, and a handheld segment sequentially connected as one unit. Its innovation lies in:

[0012] The front connecting ring includes an inner ring and an annular platform located on the outer periphery of the inner ring. A portion of the inner ring is inserted into the inner hole of the throat segment of the spring tube. The annular platform is located on the outer side of the end of the throat segment and is integrally connected to the spring tube. A through-hole for positioning the traction spring tube is provided on the inner ring along its length. The head of the traction spring tube is embedded in the traction spring tube positioning groove, and the inner wall of the annular platform is in contact with the outer wall of the traction spring tube.

[0013] The polyurethane protective tube is fitted around the outer periphery of a portion of the braided mesh tube, with one end of the polyurethane protective tube located at the junction of the pharyngeal segment and the nasal or oral segment, and the other end adjacent to the rear connecting ring and attached to the inner end face of the rear connecting ring.

[0014] 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 hand-held segment.

[0015] 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.

[0016] In the above technical solution, the pores of the braided mesh tube on the outer periphery of the handheld section of the spring tube are coated with polyurethane coating.

[0017] In the above technical solution, the spring tube is provided with two traction spring tubes, the annular platform is located in the middle part of the inner circle in the length direction, and the inner circle is provided with two symmetrically arranged traction spring tube positioning grooves along its length direction, and the head of each traction spring tube is respectively embedded in the corresponding traction spring tube positioning groove.

[0018] In the above technical solution, the spring tube is provided with two traction spring tubes, and the inner ring is provided with two traction spring tube positioning grooves along its length direction. The head of each traction spring tube is respectively embedded in the corresponding traction spring tube positioning groove, and the axis of the two traction spring tube positioning grooves is offset from the central axis of the inner ring by 4° to 6°.

[0019] 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.

[0020] 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.

[0021] In the above technical solution, the outer periphery of the polyurethane protective tube is provided with a transparent polyurethane coating to protect the length printing mark.

[0022] In the above technical solution, the rear connector has a solder injection hole that is welded to the tail of the braided mesh tube, and the rear connector is also provided with a sealing ring that is sealed to the operating handle seat.

[0023] The positive effects of this invention are as follows: When the insertion tube of the medical flexible thin laryngoscope of this invention is used, the anterior connecting ring includes an inner ring and an annular platform located on the outer periphery of the inner ring. A portion of the inner ring is inserted into 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 integrally connected to the spring tube. A through-hole for positioning the traction spring tube is provided on the inner ring along its length. The head of the traction spring tube is embedded in the traction spring tube positioning groove, and the inner wall of the annular platform is in contact with the outer wall of the traction spring tube.

[0024] The polyurethane protective tube is fitted around the outer periphery of a portion of the braided mesh tube, with one end of the polyurethane protective tube located at the junction of the pharyngeal segment and the nasal or oral segment, and the other end adjacent to the rear connecting ring and attached to the inner end face of the rear connecting ring.

[0025] The advantages of this design are as follows: First, it can further increase the space of the insertion tube aperture: 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 maximum outer diameter of the front connecting 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 will occupy the internal space. Also, since this utility model is the insertion tube of a thin-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 larger diameter forceps tube, providing sufficient space for the subsequent assembly of other internal contents.

[0026] Secondly, it improves welding strength: because the outer diameter of the traction spring tube is tightly fitted inside the entire traction spring tube positioning groove, it not only increases the contact area during welding, but also results in a high connection strength after welding, making it less prone to detachment.

[0027] 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.

[0028] 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.

[0029] Fifth, this utility model only has a polyurethane protective tube on the nasal cavity or oral cavity segment and the outer periphery of the hand-held segment. This makes the pharyngeal segment more flexible, while the hand-held segment is rigid enough to give the insertion tube sufficient insertion force, making it easy for doctors to operate. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of one specific embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A schematic diagram showing the structure after removing the rear connecting ring and the traction spring tube;

[0032] Figure 3 This is a schematic diagram of the front connector ring of this utility model;

[0033] Figure 4 yes Figure 3 Side view;

[0034] Figure 5 This is a schematic diagram of the structure of the spring tube of this utility model. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but it is not limited thereto.

[0036] like Figure 1 , 2As shown in Figures 3, 4, and 5, an insertion tube for a medical flexible thin laryngoscope includes a spring tube 1, a braided mesh tube 2, a front connecting ring 3, a polyurethane protective tube 4, a rear connecting ring 5, and a traction spring tube 6. 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 rear connecting ring 5 is fitted around the outer periphery of the tail of the braided mesh tube 2. The traction spring tube 6 is disposed within the spring tube 1, and its tail is located outside the rear connecting ring 5. 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.

[0037] 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 integrally connected to the spring tube 1. A traction spring tube positioning groove 33 is provided on the inner ring 31 along its length. The head of the traction spring tube 6 is embedded in the traction spring tube positioning groove 33, and the inner wall of the annular platform 32 is in contact with the outer wall of the traction spring tube 6.

[0038] The polyurethane protective tube 4 is fitted around the outer periphery of a portion of the braided mesh tube, with one end of the polyurethane protective tube 4 located at the junction of the pharyngeal segment 11 and the nasal or oral segment 12, and the other end adjacent to the rear connecting ring 5 and attached to the inner end face of the rear connecting ring 5.

[0039] Because the existing technology divides the insertion tube into two sections with different levels of stiffness, meaning that the latter half of the second section of the insertion tube does not enter the human body, and this transitional section outside the human body is also the handheld part, the stiffness of this section is the same as that of the first half of the second section. The disadvantage of the handheld part of the endoscope operated by the doctor is that the stiffness is insufficient. When inserting the endoscope by hand, the middle section sometimes bends automatically, which is not conducive to insertion and makes insertion somewhat difficult. The doctor's hand is not very stable when holding the latter part of the insertion tube, which is also caused by insufficient stiffness, which sometimes makes the operation difficult.

[0040] 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:

[0041] like Figure 5 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 less than the spring pitch P3 of the hand-held segment 13.

[0042] Therefore, the spring tube of this utility model is divided into two sections with different hardness, namely the throat section and the nasal or oral cavity section with the same hardness, and the throat section is softer than the hand-held section. Furthermore, since the nasal or oral cavity section and the hand-held section are provided with polyurethane protective tubes around the woven mesh tube, the insertion tube as a whole forms three sections with different hardness.

[0043] Thus, the insertion tube of this invention has three sections: the first section is inserted into the pharynx, deep into the throat; the second section is the nasal or oral cavity section (for thin tubes, this section 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, facilitating the 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, without affecting the flexibility of the front part of the insertion tube, avoids the automatic bending caused by the relatively soft middle section, making insertion easier. It also ensures the stability of the insertion into the nasal or oral cavity section and the holding part, improving the insertability of the laryngoscope, facilitating the doctor's operation, shortening the time for insertion, examination, and diagnosis of related throat diseases, and reducing patient discomfort.

[0044] Furthermore, such as Figure 4 As shown, in order to facilitate the positioning and connection with the curved snake bone of the insertion tube, and also to provide positioning screw holes for positioning the camera to 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, diagnosis, etc., the inner ring 31 of the front connecting ring 3 is provided with a pair of snake bone connecting holes 34 symmetrically arranged along it. 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, so that the stability after the snake bone is connected at three points is better.

[0045] 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. Therefore, in this invention, the pores of the braided mesh tube on the outer circumference of the handheld section 13 of the spring tube 1 are coated with polyurethane coating.

[0046] Specifically, the braided mesh tube 2 is made of steel wire. Only the pores of the braided mesh tube on the outer periphery of the handheld section 13 are impregnated with a liquid polyurethane coating, which is located in a star-shaped pattern in the pores of the outer diameter of the braided mesh tube. The maximum outer diameter of the steel wire is not coated with the liquid coating. In this way, the bending rigidity of this section is increased without increasing the outer diameter of the skeleton. At the same time, the plastic coating increases the insertion force of this part and makes it more convenient for doctors to operate and use.

[0047] Furthermore, such as Figure 1 , 5As shown, in order to facilitate the positioning and assembly with the two traction spring tubes and to enable the insertion tube to bend in two directions, the spring tube 1 is provided with two traction spring tubes 6. The annular platform 32 is located in the middle part of the inner ring 31 along its length direction. The inner ring 31 is provided with two symmetrically arranged traction spring tube positioning grooves 33 along its length direction, and the head of each traction spring tube 6 is respectively embedded in the corresponding traction spring tube positioning groove 33.

[0048] Furthermore, such as Figure 5 As shown, the spring tube 1 contains two traction spring tubes 6. The inner ring 31 has two traction spring tube positioning grooves 33 along its length. The head of each traction spring tube 6 is respectively embedded in the corresponding traction spring tube positioning groove 33. 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°, which is consistent with the offset angle of the traction steel wire rope in the curved part of the endoscope. This divides the internal space of the inner ring 31 into two sides of approximately 190° and approximately 170°. Alternatively, four equally divided traction spring tube positioning grooves can be designed along the circumference of the inner ring 31.

[0049] The advantages of this design are as follows: Advantage 1: It increases the space of the insertion tube aperture, which is conducive to the assembly of the largest forceps tube of pediatric laryngoscopes, and allows the entry of larger minimally invasive surgical instruments, such as large biopsy forceps, through the large forceps tube for minimally invasive surgery; Advantage 2: It can assemble and produce fine endoscopes with four-way serpentine bends, which not only provide fixed welding but also give it a wide field of view; Advantage 3: The traction spring tube is soldered from the slot of 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 the 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.).

[0050] Advantage 4: Standard-sized forceps canal 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 section 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 section are on the same concentric axis, but this does not affect the bend angle of the curved section of the endoscope. Because the connecting shafts of the two sets (two rows) of curved sections are still designed at a symmetrical 180-degree position, the directional position remains unchanged after bending in both directions, remaining in a 180-degree plane position, and is not affected when operating the bend angle.

[0051] Furthermore, such as Figure 2As 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.

[0052] Furthermore, such as Figure 5 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.

[0053] Furthermore, such as Figure 5 As shown, 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.

[0054] 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.

[0055] Furthermore, such as Figure 1 As shown, in order to prevent frequent high-temperature sterilization of the insertion tube from affecting the clarity of the length printing mark, and to improve the smoothness of the overall outer surface of the insertion tube and improve the smoothness of insertion, the outer periphery of the polyurethane protective tube 4 is provided with a transparent polyurethane coating 7 to protect the length printing mark.

[0056] Furthermore, such as Figure 1 As shown, to ensure a stable connection between the rear connector and the braided mesh tube, the rear connector 5 has a solder injection hole that is integrally welded to the tail of the braided mesh tube 2. Furthermore, to ensure a tight seal between the rear connector and the operating handle and prevent gaps, the rear connector 5 is also equipped with a sealing ring 51 that seals with the operating handle seat. This structure enhances the sealing performance, aiming to prevent moisture from entering the operating handle during the high-temperature sterilization process of the insertion tube.

[0057] In summary, the advantages of this utility model are:

[0058] (1) Structural improvements to the front connector:

[0059] First, it offers the advantage of further increasing the insertion tube's aperture space: the traction spring tube can be welded tightly to the bottom of the traction spring tube positioning groove on the inner ring, allowing the outer diameter of the traction spring tube to fit snugly within the annular platform hole of the largest outer diameter of the front connecting 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 front connecting ring, thus occupying internal space. Furthermore, since this invention is for the insertion tube of 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.

[0060] Secondly, it improves welding strength: because the outer diameter of the traction spring tube is tightly fitted inside the entire traction spring tube positioning groove, it not only increases the contact area during welding, but also results in a high connection strength after welding, making it less prone to detachment.

[0061] 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.

[0062] 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.

[0063] (2) Improvements to the overall skeleton, which consists of three sections with different levels of hardness:

[0064] This utility model's spring tube has the same hardness in the pharyngeal and nasal or oral cavity sections, with the pharyngeal section being more flexible than the handheld section. Furthermore, the rear section's outer periphery is protected by a polyurethane sheath, creating three sections of varying hardness in the insertion tube assembly. 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 of the insertion tube, avoids the automatic bending caused by the relatively soft middle section, making insertion easier. It also ensures the stability of insertion into the nasal or oral cavity and handheld sections, improving the laryngoscope's insertability, facilitating doctor's operation, and shortening the time for insertion, examination, and diagnosis of related pharyngeal diseases, thus reducing patient discomfort.

[0065] 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. An insertion tube for a flexible, thin laryngoscope, comprising a spring tube (1), a braided mesh tube (2), a front connecting ring (3), a polyurethane protective tube (4), a rear connecting ring (5), and a traction spring tube (6), 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); the rear connecting ring (5) is fitted around the outer periphery of the tail of the braided mesh tube (2); the traction spring tube (6) is disposed within the spring tube (1), and its tail is located outside the rear connecting ring (5); the spring tube (1) comprises a pharyngeal segment (11), a nasal or oral segment (12), and a handheld segment (13) sequentially connected as a single unit, characterized in that: 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 through traction spring tube positioning groove (33) is provided on the inner ring (31) along its length. The head of the traction spring tube (6) is embedded in the traction spring tube positioning groove (33), and the inner wall of the annular platform (32) is in contact with the outer wall of the traction spring tube (6). The polyurethane protective tube (4) is fitted around the outer periphery of a portion of the braided mesh tube, with one end of the polyurethane protective tube (4) located at the junction of the pharyngeal segment (11) and the nasal or oral segment (12), and the other end adjacent to the rear connecting ring (5) and attached to the inner end face of the rear connecting ring (5).

2. The insertion tube of the medical flexible thin laryngoscope 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 less than the spring pitch P3 of the hand-held segment (13).

3. The insertion tube of the medical flexible thin laryngoscope 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 insertion tube of the medical flexible thin laryngoscope 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 insertion tube of the medical flexible thin laryngoscope according to claim 1, characterized in that: The spring tube (1) is provided with two traction spring tubes (6). The annular platform (32) is located in the middle part of the inner ring (31) along its length. The inner ring (31) is provided with two symmetrically arranged traction spring tube positioning grooves (33) along its length. The head of each traction spring tube (6) is respectively embedded in the corresponding traction spring tube positioning groove (33).

6. The insertion tube of the medical flexible thin laryngoscope according to claim 1, characterized in that: The spring tube (1) is provided with two traction spring tubes (6), and the inner ring (31) is provided with two traction spring tube positioning grooves (33) along its length. The head of each traction spring tube (6) is respectively embedded in the corresponding traction spring tube positioning groove (33), and the axis of the two traction spring tube positioning grooves (33) is offset from the central axis of the inner ring (31) by 4° to 6°.

7. The insertion tube of the medical flexible thin laryngoscope 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 insertion tube of the medical flexible thin laryngoscope 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 insertion tube of the medical flexible thin laryngoscope according to claim 1, characterized in that: The outer periphery of the polyurethane protective tube (4) is provided with a transparent polyurethane coating (7) to protect the length printed mark.

10. The insertion tube of the medical flexible thin laryngoscope according to claim 1, characterized in that: The rear connector (5) has a solder injection hole that is welded to the tail of the braided mesh tube (2), and the rear connector (5) is also provided with a sealing ring (51) that is sealed to the operating handle seat.

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