Soft thin pharyngoscope insertion tube assembly

Abstract

The invention relates to a soft thin pharyngoscope insertion tube assembly which comprises a spring tube, a woven mesh tube, a polyurethane protective tube, a front connecting ring, a rear connecting ring and a traction spring tube, the spring tube is arranged in the woven mesh tube, the rear connecting ring is arranged on the periphery of the tail of the woven mesh tube in a sleeving mode, the traction spring tube is arranged in the spring tube, a sealing unit is arranged on the periphery of the rear connecting ring, and the sealing unit is connected 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 in the end of the spring tube, a through traction spring tube positioning groove is formed in the inner ring body, and the head of the traction spring tube is embedded in the traction spring tube positioning groove. And a flexible protection tube is arranged on the rest part section of the inner ring and the periphery of the woven mesh tube covering the throat section. According to the invention, high-precision positioning connection can be realized, and the aperture space of the insertion tube is increased, so that a minimally invasive surgical instrument with a larger specification can enter and be inserted more stably, powerfully and smoothly.

Description

Technical Field

[0001] The invention relates to an insertion tube assembly, in particular to a soft thin pharyngoscope insertion tube assembly, belonging to the technical field of endoscopes. Background Art

[0002] Medical soft pharyngoscopes have been widely used in the diagnosis of upper respiratory system diseases, or minimally invasive surgery or treatment of related diseases in the nasal cavity, nasopharynx, throat, and other parts. The insertion tube of the soft pharyngoscope is inserted into the nasal cavity, nasopharynx, throat, and all the way to the glottic fissure of the upper respiratory tract for examination and diagnosis or some minimally invasive surgical treatments. In the prior art, the pharyngoscope can be inserted through the nasal cavity or oral cavity. Affected by the part of use, the overall size will be very thin. For pediatric pharyngoscopes, the overall size will be thinner and the inner diameter will be smaller, which means that it is difficult for standard minimally invasive surgical auxiliary instruments to enter. The use scenarios of pediatric pharyngoscopes are further explained.

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

[0004] 2. The insertion tube of the thin soft pharyngoscope is one of the most critical components of the medical soft endoscope. The pharyngeal and laryngeal cavities of children are much smaller than those of adults, so it is difficult to design and produce thin pharyngeal endoscopes. Therefore, it is necessary to design and develop a thin insertion tube of the soft endoscope that will not damage the pharyngeal cavity of children.

[0005] At present, in the soft pharyngoscope insertion tube assembly in the prior art, first, since the front connecting ring is a single annular structure and is integrally arranged in the inner hole of the spring tube, the traction spring tube is directly welded on the inner wall of the aperture of the front connecting ring, which results in the low positioning accuracy of the traction spring tube after welding and the defect of angle deviation. That 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 bending part snake bone assembly connected to the front connecting ring is not coaxial, causing the steel rope of the traction angle on the snake bone to be coaxial with the traction spring tube. When the steel rope pulls the angle, the greater the deviation of the steel rope, the greater the friction. If the pulling friction is too much, the steel rope will break due to excessive friction, causing the bending function of the endoscope to be unusable, and medical accidents may occur in severe cases.

[0006] Second, the outer diameter of the traction spring tube is welded to the hole wall of the front connecting ring, which not only has a small contact welding area, but also has low welding strength and is prone to falling off;

[0007] Thirdly, since the outer diameter of the traction spring is directly welded to the inner wall of the front connection ring, and the traction spring tube has an overall cylindrical structure, it will occupy a part of the space in the inner hole of the front connection ring. When inserting the hidden objects into the inner hole of the endoscope insertion tube subsequently, it will seem rather crowded. For some minimally invasive surgical instruments with larger specifications (such as forceps channels and biopsy forceps), it may even be impossible to insert.

[0008] Fourthly, in the prior art, an equal-length polyurethane protective tube is sleeved on the outer periphery of the braided network tube, making the front part of the insertion tube not soft enough and the rear part not hard enough. When the doctor holds and inserts it, the not-soft-enough front part (throat section) inserted into the patient's body will cause discomfort, and the rear part (handheld section) will be unstable and lack insertion force, resulting in difficult operation. Summary of the Invention

[0009] The object of the present invention is to provide a soft and thin laryngoscope insertion tube assembly that can not only achieve high-precision positioning connection, but also increase the internal space after the inner wall of the annular platform of the front connection ring fits with the outer wall of the traction spring tube, thereby increasing the internal space of the insertion tube, enabling larger-specification minimally invasive surgical instruments to enter, and having a more stable, powerful and smooth insertion.

[0010] To achieve the above object, the technical solution of the present invention is: a soft and thin laryngoscope insertion tube assembly, including an insertion tube skeleton, a bending traction unit and a sealing unit.

[0011] The insertion tube skeleton includes a spring tube, a braided network tube and a polyurethane protective tube. The braided network tube is sleeved on the outer periphery of the spring tube, and both ends of the braided network tube are integrated with both ends of the spring tube. The spring tube includes a throat section, a nasal cavity or oral cavity section and a handheld section that are integrated in sequence.

[0012] The bending traction unit includes a front connection ring, a rear connection ring and a traction spring tube. The rear connection ring is sleeved on the outer periphery of the tail of the braided network tube. The traction spring tube is arranged in the spring tube, and its tail is located outside the rear connection ring. A sealing unit connected to the operating handle is provided on the outer periphery of the rear connection ring.

[0013] Its innovation lies in:

[0014] The front connection ring has an overall double-ring structure, and it includes an inner ring and an annular platform provided on the outer periphery of the inner ring. A partial section of the inner ring is inserted into the inner hole of the throat section of the spring tube. The annular platform is located outside the end of the throat section and is integrated with the spring tube. A through traction spring tube positioning groove is provided on the inner ring along its length direction. The head of the traction spring tube is embedded in the traction spring tube positioning groove, and the inner wall of the annular platform fits with the outer wall of the traction spring tube.

[0015] The polyurethane protection tube is sleeved on the outer periphery of part of the braided net tube, one end of the polyurethane protection tube is located at the junction of the pharyngeal section and the nasal cavity or oral cavity section, and the other end is adjacent to the rear connection ring and fits on the inner end face of the rear connection ring.

[0016] A flexible protection tube is provided on the remaining part of the inner ring and on the outer periphery of the braided net tube covering the pharyngeal section, and the flexibility of the flexible protection tube is greater than that of the polyurethane protection tube.

[0017] In the above technical solution, the spring pitch P of the pharyngeal section 1 and the spring pitch P of the nasal cavity or oral cavity section 2 are equal, and the spring pitch P of the nasal cavity or oral cavity section 2 is less than the spring pitch P of the handheld section 3 .

[0018] In the above technical solution, a pair of snake bone connection holes are symmetrically arranged along the inner ring of the front connection ring, or three equally distributed snake bone connection holes are arranged along the circumferential direction of the inner ring of the front connection ring.

[0019] In the above technical solution, a polyurethane coating is applied to the pores of the braided net tube on the outer periphery of the handheld section of the spring tube.

[0020] In the above technical solution, two or four traction spring tubes are provided in the spring tube, the annular platform is located at the middle part in the length direction of the inner ring, and two symmetrically arranged or four equally divided traction spring tube positioning grooves are provided on the inner ring along its length direction, and the head parts of each traction spring tube are respectively embedded in the corresponding traction spring tube positioning grooves.

[0021] In the above technical solution, when two symmetrically arranged traction spring tube positioning grooves are provided on the inner ring along its length direction, the axes of the two traction spring tube positioning grooves are offset from the central axis of the inner ring by 4° to 6°; or, when four cross-shaped traction spring tube positioning grooves are provided on the inner ring along its length direction, the axes of the two relatively arranged traction spring tube positioning grooves are offset from the central axis of the inner ring by 4° to 6°.

[0022] 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 net tube.

[0023] In the above technical solution, the spring pitch P of the pharyngeal section 1 and the spring pitch P of the nasal cavity or oral cavity section 2 are both 1.7 mm to 2.2 mm, and the spring pitch P of the handheld section 3 is 2.2 mm to 2.8 mm.

[0024] In the above technical solution, a polyurethane coating which is used to protect the length printing mark and is transparent is provided on the outer periphery of the polyurethane protection tube.

[0025] In the above technical solution, the sealing unit includes a sealing cone sleeve and a sealing cone sleeve insert. The sealing cone sleeve insert is arranged on the outer periphery of a rear socket which is hermetically connected to the operating handle. The sealing cone sleeve is connected to the sealing cone sleeve insert.

[0026] The rear socket has a solder injection hole which is integrally welded to the tail of the braided network tube. A sealing ring which is hermetically connected to the operating handle socket is also provided on the rear socket.

[0027] In the above technical solution, the joint of the flexible protection tube and the polyurethane protection tube is fixed by a bundling wire, and a medical epoxy glue is also coated on the bundling wire.

[0028] In the above technical solution, a spring tube fixing sleeve which is positioned and connected to the operating handle connecting plate is provided at the tail of the traction spring tube. A positioning step is provided on the outer periphery of the spring tube fixing sleeve.

[0029] The positive effects of the present invention are as follows: After the soft and thin laryngoscope insertion tube assembly of the present invention is adopted, since the front connecting ring of the present invention is integrally in a double-ring structure, and it includes an inner ring and an annular platform arranged on the outer periphery of the inner ring, and a partial section of the inner ring is inserted into the inner hole of the throat section of the spring tube, the annular platform is located outside the end of the throat section and is integrally connected with the spring tube. A through traction spring tube positioning groove is provided on the inner ring along its length direction. 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 attached to the outer wall of the traction spring tube.

[0030] The polyurethane protection tube is sleeved on the outer periphery of a part of the braided network tube. One end of the polyurethane protection tube is located at the junction of the throat section and the nasal cavity or oral cavity section, and the other end is adjacent to the rear connecting ring and is attached to the inner end face of the rear connecting ring.

[0031] The remaining partial section of the inner ring and the outer periphery of the braided network tube covering the throat section are provided with a flexible protection tube, and the flexibility of the flexible protection tube is greater than that of the polyurethane protection tube.

[0032] The beneficial effects of the present invention are as follows.

[0033] First, it is possible to further increase the advantages of the aperture space of the insertion tube: The traction spring tube of the present invention can be welded closely to the bottom of the positioning groove of the traction spring tube on the inner ring, so that the outer diameter of the traction spring tube is closely attached to the annular table hole with the largest outer diameter of the front connecting ring. The outer arc surface of the traction spring tube and the inner arc surface of the inner ring are on the same plane, and a lot of space position is increased for its insertion tube, overcoming the problem that the overall fitting of the traction spring tube on the inner wall of the front connecting ring in the prior art will occupy the internal space. Also, since the insertion tube of the present invention is a thin-diameter and thin-type laryngoscope, when the aperture space of the insertion tube is increased, it is convenient to assemble the inner contents such as the forceps channel tube with a relatively thick diameter into the insertion tube, providing sufficient space position for subsequent assembly of other internal contents;

[0034] Second, improve the welding strength: Since the outer diameter of the traction spring tube is closely attached to the entire positioning groove of the traction spring tube, it not only increases the contact area during welding, but also has a high connection strength after welding and is not easily detached.

[0035] Third, during mass production assembly, welding is more convenient and the welding efficiency is improved: Because both outer diameter openings at both ends of the positioning groove of the traction spring tube can be welded to the contact part of the traction spring tube, welding is very convenient and efficient during production assembly;

[0036] Fourth, the positioning accuracy is high. Since the structure of the front connecting ring of the present invention is improved to a combined structure of an inner ring and an outer convex platform, and the inner ring is provided with a positioning groove for the traction spring tube, therefore, the traction spring tube can be directly positioned and matched with the positioning groove of the traction spring tube and then welded, overcoming the drawback that the traction spring tube is blindly welded at a general position on the front connecting ring in the prior art, ensuring that the relative position between the traction spring tube and the front connecting ring will not deviate. It should be added that since a traction steel wire rope connected to the bending snake bone of the insertion tube is installed in the traction spring tube, this ensures the advantage that the orientation of the captured upright image of the camera at the very front end of the insertion part is consistent. When pulling the traction steel wire rope, there will also be no situation of excessive friction caused by deviation, enabling the bending angle of the insertion tube in different directions to be accurately bent on a 180° plane, further improving the comfort performance of the subsequent operation of the bending angle and making the effect of the doctor's operation of the bending angle better.

[0037] Fifth, the present invention is only provided with a polyurethane protection tube on the outer periphery of the nasal cavity or oral cavity section and the handheld section, while a flexible protection tube softer than the polyurethane protection tube is provided on the outer periphery of the braided net tube in the throat section. In this way, the throat section can be made softer, and the hardness of the handheld section is increased, making it have sufficient insertion force and facilitating the doctor's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a structural schematic diagram (two directions) of the first specific embodiment of the present invention;

[0039] Figure 2 isFigure 1 Schematic diagram after the insertion tube skeleton and the front adapter ring are assembled;

[0040] Figure 3 is Figure 1 Schematic structural diagram of the front adapter ring of;

[0041] Figure 4 is Figure 3 Schematic side view of;

[0042] Figure 5 Schematic structural diagram of the bourdon tube of the present invention;

[0043] Figure 6 Schematic structural diagram of the second specific embodiment of the present invention (four directions);

[0044] Figure 7 is Figure 6 Schematic structural diagram of the front adapter ring in;

[0045] Figure 8 is Figure 7 Schematic side view of. Specific embodiments

[0046] The present invention will be further described below in conjunction with the accompanying drawings and the given embodiments, but is not limited thereto.

[0047] Embodiment 1

[0048] As Figure 1 , 2 , 3, 4, 5 show, a two-direction insertion tube assembly of a flexible thin laryngoscope, including an insertion tube skeleton, a bending angle traction unit and a sealing unit,

[0049] The insertion tube skeleton includes a bourdon tube 1, a braided net tube 2 and a polyurethane protection tube 4. The braided net tube 2 is sleeved on the outer periphery of the bourdon tube 1, and both ends of the braided net tube 2 are integrally connected to both ends of the bourdon tube 1. The bourdon tube 1 includes a throat section 11, a nasal cavity or oral cavity section 12 and a hand-held section 13 that are integrally connected in sequence,

[0050] The bending angle traction unit includes a front adapter ring 3, a rear adapter ring 5 and two traction bourdon tubes 6. The rear adapter ring 5 is sleeved on the outer periphery of the tail of the braided net tube 2. The traction bourdon tube 6 is arranged in the bourdon tube 1, and the tail is located outside the rear adapter ring 5. A sealing unit connected to the operation handle is provided on the outer periphery of the rear adapter ring 5,

[0051] The front connecting ring 3 as a whole has a double-ring structure, and it includes an inner ring 31 and an annular platform 32 provided on the outer periphery of the inner ring 31. A partial section 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. Two through traction spring tube positioning grooves 33 are provided on the inner ring 31 along its length direction. The head of each traction spring tube 6 is fitted into the corresponding 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.

[0052] The polyurethane protective tube 4 is sleeved on the outer periphery of a part of the braided net tube. One end of the polyurethane protective tube 4 is located at the junction of the throat section 11 and the nasal cavity or oral cavity section 12, and the other end is adjacent to the rear connecting ring 5 and is attached to the inner end face of the rear connecting ring 5.

[0053] A flexible protective tube 7 is provided on the remaining partial section of the inner ring 31 and the outer periphery of the braided net tube covering the throat section 11. The flexibility of the flexible protective tube 7 is greater than that of the polyurethane protective tube 4. For example, the flexible protective tube is a silicone tube.

[0054] Since the spring tube of the insertion tube skeleton in the prior art is divided into two sections with different softness and hardness, that is to say, the latter half of the second section does not enter the human body. That is, the transition section outside the human body is also held by hand for the insertion tube skeleton, and the softness and hardness of this section are the same as those of the first half of the second section. This will cause the hardness of the handheld section of the endoscope during the subsequent operation by the doctor to be insufficient. When inserting by hand, the middle section (the first half of the second section) sometimes bends automatically, which is not conducive to insertion, making the insertion a bit difficult at this time. In addition, the softness and hardness of the latter half of the second section are also not in place, resulting in the doctor's hand holding the rear section of the insertion tube (skeleton) not being very stable, causing a chain reaction of difficult insertion.

[0055] To solve the above problems, the insertion tube of the present invention is divided into three sections with different softness and hardness. The specific implementation structure is as follows: The spring pitch P of the throat section 11 1 and the spring pitch P of the nasal cavity or oral cavity section 12 2 are equal, and the spring pitch P of the nasal cavity or oral cavity section 12 2 is less than the spring pitch P of the handheld section 13 3 .

[0056] It can be seen that the overall spring tube 1 is divided into two segments with different softness and hardness. That is, the softness and hardness of the pharyngeal segment are the same as those of the nasal cavity or oral cavity segment, and the pharyngeal segment is softer than the handheld segment. Also, since a polyurethane protection tube is provided on the outer periphery of the braided network tube on the outer periphery of the nasal cavity or oral cavity segment and the handheld segment, a flexible protection tube 7 is provided on the outer periphery of the remaining part of the inner ring 31 and the braided network tube covering the pharyngeal segment 11. The flexibility of the flexible protection tube 7 is greater than that of the polyurethane protection tube 4, so that the overall insertion tube forms three segments with different softness and hardness. The pharyngeal segment is the softest as a whole, the nasal cavity or oral cavity segment is the second, and the handheld segment has the greatest hardness.

[0057] In this way, the first segment of the insertion tube of the present invention from the front to the back is inserted into the pharyngeal segment, that is, inserted deep into the pharynx; the second segment length is the nasal cavity or oral cavity segment (the thin insertion tube enters the pharynx or part of the esophagus from the oral cavity to clamp foreign objects such as fish bones), and it can also be inserted into the pharynx from the nostril; the third segment length is the handheld part of the operator, which is beneficial for the better insertion of the first two segments. When the laryngoscope is inserted into the pharyngeal cavity for examination and diagnosis, the rear segment is the handheld segment when the operator inserts it. This improvement point, without affecting the flexibility of the front part of the insertion tube, avoids the automatic bending of the middle segment due to its relatively softness, is more conducive to insertion, ensures the stability of the insertion of the nasal cavity or oral cavity segment and the handheld segment can be guaranteed, improves the insertability of the laryngoscope, and facilitates the operation of the doctor, shortening the time for inserting, examining, and diagnosing whether there are related diseases in the pharynx to reduce the pain of the patient.

[0058] Furthermore, as Figure 3 、 4 shown, for the convenience of positioning and connecting with the bending snake bone of the insertion tube, and also for the positioning screw holes for positioning the correct direction and orientation of the camera during the use and diagnosis of the medical electronic endoscope, that is, to maintain an upright image and improve the use quality such as its operation, examination, and diagnosis, a pair of snake bone connection holes 34 symmetrically arranged along it are provided on the inner ring 31 of the front connection ring 3. Of course, three equally distributed snake bone connection holes 34 can also be provided on the inner ring 31 of the front connection ring 3 along its circumferential direction. In this way, the stability after connecting the snake bone at three points is better.

[0059] In the prior art, a plastic coating layer formed by curing polyurethane paint is provided on the outer peripheral surface of the braided network tube, and then a polyurethane protection tube is sleeved on the outer periphery of the braided network tube. This will not only increase the overall outer diameter of the insertion tube but also overly enhance the hardness, which is not conducive to the insertion operation. Therefore, polyurethane paint is applied to the pores of the braided network tube on the outer periphery of the handheld segment 13 of the spring tube 1 of the present invention.

[0060] Specifically, the braided network tube 2 is made of steel wire. Only the pores of the braided network tube on the outer periphery of the handheld section 13 are impregnated with the liquid polyurethane coating by dipping, and it is dotted in the pores on the outer diameter of the braided network tube, increasing the bending rigidity of this section. That is to say, after dipping, the insertion force of the handheld section is increased, making it more convenient for doctors to operate. Also, because the liquid coating here is only coated in the gaps of the steel wire, the maximum outer diameter of the steel wire is not coated with the liquid coating, which will not additionally increase the outer diameter size of the framework, and has the advantages of increasing the insertion force of the insertion tube, etc.

[0061] Further, as Figure 3 shown, in order to make the structure of the front connection ring more reasonable, the annular platform 32 is located at the middle part in the length direction of the inner ring 31, ensuring the balance and stability after the traction spring tube 6 and the front connection ring 3 are assembled.

[0062] Further, as Figure 4 shown, 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°. According to the large angle in space, the internal space of the inner ring 31 is divided into two unequal parts, one side is about 190°, and the other side is about 170°.

[0063] The advantages of such a design are as follows: Advantage 1, it increases the space of the aperture of the insertion tube, which is beneficial to assembling the largest forceps channel tube such as a pediatric laryngoscope. Larger minimally invasive surgical instruments, such as large biopsy forceps and other instruments, can enter through the large forceps channel tube for minimally invasive surgery.

[0064] Advantage 2, the traction spring tube is soldered from the notch on the outer diameter of the front connection ring, so that the outer diameter of the traction spring tube in the long groove and assembled in the groove is filled with solder, and the welding strength is higher, and the welding effect can be visually inspected. In the prior art, the outer diameter of this positioning groove structure is not through, and soldering is implemented in the hole of this part, and it is almost impossible to clearly see the welding effect, etc.

[0065] Advantage 3, the standard specification forceps channel tube of the laryngoscope can also be installed in the large space position inside the thin insertion tube. The angle by which the traction spring tube positioning groove of the present invention is offset corresponds to the angle by which the traction steel wire rope of the snake bone in the bending part of the endoscope is offset, that is, the synchronous offset angle. That is to say, the angular position of the traction spring tube and the angular position of the traction steel wire rope of the snake bone in the bending part are on the same concentric axis, but it does not affect the bending angle of the snake bone in the bending part of the endoscope. Because the connecting shafts connecting the two groups (two rows) of the bending snake bones are still designed at the symmetrical 180-degree position, the direction positions after pulling the two-direction bending angles remain unchanged and are still in the 180-degree plane position, and there is no influence when operating the bending angle.

[0066] Further, as Figure 2As shown, in order to make the structure more reasonable without increasing the outer diameter size, 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 net tube 2.

[0067] Furthermore, in order to further improve the rationality of the structure, the spring pitch P of the throat section 11 of the present invention 1 and the spring pitch P of the nasal cavity or oral cavity section 12 2 are both 1.7 mm to 2.2 mm, and the spring pitch P of the hand-held section 13 3 is 2.2 mm to 2.8 mm.

[0068] Furthermore, as Figure 5 shown, the total length L of the spring tube 1 is 450 mm to 540 mm, the length L1 of the throat section 11 is 75 mm to 90 mm, the length L2 of the nasal cavity or oral cavity section 12 is 225 mm to 270 mm, the length L3 of the hand-held section 13 is 150 mm to 180 mm, and the inner diameter of the spring tube 1 is Φ2.4 mm to Φ3.0 mm.

[0069] Furthermore, in order to ensure that the softness of the part of the polyurethane protective tube sleeved on the rear section of the insertion tube meets the technical requirements, the Shore hardness of the polyurethane protective tube 4 is 46A to 50A.

[0070] Furthermore, as Figure 1 shown, in order to prevent the frequent high-temperature disinfection 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 the smoothness of insertion, a transparent polyurethane coating 8 for protecting the length printing mark is provided on the outer periphery of the polyurethane protective tube 4.

[0071] Furthermore, as Figure 1 shown, in order to ensure that the insertion tube assembly can form a sealed connection with the operating handle, and to prevent water vapor from entering the inside of the operating handle from the connection part due to the frequent high-temperature disinfection of the insertion tube assembly and eroding the relevant components, the sealing unit includes a sealing cone sleeve 9 and a sealing cone sleeve insert 10. The sealing cone sleeve insert 10 is provided on the outer periphery of the rear socket 5 that is sealedly connected to the operating handle. The sealing cone sleeve 9 is connected to the sealing cone sleeve insert 10, and the sealing cone sleeve insert 10 also forms a sealed connection with the end face of the operating handle. In the present invention, the sealing cone sleeve insert 10 is completed by turning on a lathe, and then the sealing cone sleeve insert is installed in the vulcanization mold of the sealing cone sleeve and vulcanized into an integrated "sealing cone sleeve nut" structure.

[0072] In order to improve the quick connection between the rear connector and the braided network tube and ensure the sealing performance between the rear connector and the operating handle, the rear connector 5 is provided with a solder injection hole welded integrally with the tail of the braided network tube 2, and a sealing ring 51 for sealing connection with the operating handle seat is further provided on the rear connector 5.

[0073] Furthermore, as Figure 1 shown, in order to ensure the firmness of the joint between the flexible protection tube and the polyurethane protection tube, the joint of the flexible protection tube 7 and the polyurethane protection tube 4 is fixed by a binding wire, and a medical epoxy glue is also coated on the binding wire to ensure the smoothness of the surface of the binding wire and prevent damage to the surface mucosa during insertion into the human body for diagnosis.

[0074] In the conventional technology, the traction spring tube is welded integrally with the connecting plate of the operating handle. When subsequent maintenance is required, it is not easy to disassemble, which not only consumes time and effort but also reduces the maintenance efficiency.

[0075] To solve the above problems, as Figure 1 shown, a spring tube fixing sleeve 61 for positioning connection with the connecting plate of the operating handle is provided at the tail of the traction spring tube 6.

[0076] Furthermore, as Figure 1 shown, in order to ensure the reliability of the positioning connection after the spring fixing joint is assembled with the connecting plate of the operating handle, a positioning step 611 is provided on the outer periphery of the spring tube fixing sleeve 61. During specific assembly, the positioning step 611 is clamped in the clamping positioning groove of the connecting plate of the operating handle 4 (formed by 90° bending). When the traction steel wire rope in the traction spring tube is operated, the spring tube fixing sleeve will not fall off from the clamping positioning groove of the 90° connecting plate. However, during maintenance, it only needs to be taken out from the clamping positioning groove of the connecting plate, which greatly facilitates the rapid development of maintenance work.

[0077] Embodiment 2

[0078] As Figure 6 、 7 、8 shown, Embodiment 2 is a soft and thin laryngoscope four-direction insertion tube assembly, which is different from Embodiment 1 in that: the bending angle traction unit includes four traction spring tubes 6, and four through traction spring tube positioning grooves 33 are provided on the inner ring 31 along its length direction, and the head of each traction spring tube 6 is embedded in the corresponding traction spring tube positioning groove 33.

[0079] This thin laryngoscope of Embodiment 2 can realize the bending of the insertion tube assembly in four directions of up, down, left and right, and can observe the focus more comprehensively, making the diagnosis more accurate.

[0080] In Embodiment 2, the axes of two of the four traction spring tube positioning grooves that are oppositely arranged in the traction spring tube positioning grooves 33 are offset from the central axis of the inner ring 31 by 4° to 6°. The advantages of such a design are the same as those in Embodiment 1 and will not be elaborated here.

[0081] Furthermore, the present invention is designed with 3 embodiments with different technical parameters, as shown in Table 1:

[0082]

[0083]

[0084] In summary, the advantages of the present invention are:

[0085] (1) Structural improvement of the front adapter ring:

[0086] First, the advantage of further increasing the aperture space of the insertion tube: The overall design of the front adapter ring is a double-ring structure. The traction spring tube can be welded closely 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 closely attached to the annular table hole of the maximum outer diameter of the front adapter ring, and its insertion tube has a much larger space position. This overcomes the problem that the overall attachment of the traction spring tube to the inner wall of the front adapter ring in the prior art will occupy the internal space. Also, since the insertion tube of the present invention is a thin-diameter and thin-type laryngoscope, when the aperture space of the insertion tube increases, it is convenient to assemble the internal contents such as the forceps channel tube with a relatively thick diameter into the insertion tube, providing sufficient space position for subsequent assembly of other internal contents.

[0087] Second, improving the welding strength: Since the outer diameter of the traction spring tube is closely attached to the entire traction spring tube positioning groove, not only does it increase the contact area during welding, but also the connection strength after welding is high and it is not easy to cause detachment.

[0088] Third, during assembly production, welding is more convenient and the welding efficiency is improved: Because both outer diameter openings at both ends of the traction spring tube positioning groove can be welded to the contact part of the traction spring tube, welding is very convenient during production assembly.

[0089] Fourth, it has high positioning accuracy. Since a traction spring tube positioning groove is provided on the inner ring of the front connecting ring, the traction spring tube is directly positioned and fitted with the traction spring tube positioning groove and then welded, overcoming the drawback in the prior art that the traction spring tube is blindly welded at a rough position on the front connecting ring, ensuring that the relative position between the traction spring tube and the front connecting ring will not deviate. It should be added that since a traction steel wire rope connected to the bent corner snake bone of the insertion tube is installed in the traction spring tube, it ensures the advantage that the orientation of the camera at the very front end of the insertion part for capturing a frontal image is consistent. When pulling the traction steel wire rope, there will be no situation of excessive friction caused by deviation, enabling the bent angles of the insertion tube in different directions to be precisely bent on a 180° plane, further improving the comfort performance of the subsequent operation of the bent angle and making the effect of the doctor's operation of the bent angle better.

[0090] (2) Improvement on the overall insertion tube skeleton with three different softness degrees:

[0091] The softness degrees of the pharynx section and the nasal cavity or oral cavity section of the spring tube of the present invention are the same, and the pharynx section is softer than the hand-held section. Also, since a flexible protection tube (silicone tube) is provided on the outer periphery of the pharynx section of the insertion tube skeleton, and a polyurethane protection tube is provided on the outer periphery of the remaining part, and the flexible protection tube is softer than the polyurethane protection tube, the combined insertion tube skeleton forms three different softness degrees. When the laryngoscope is inserted into the pharyngeal cavity for examination and diagnosis, the rear section is the hand-held section when the operator inserts it. This improvement point does not affect the flexibility of the front part of the insertion tube, avoids the automatic bending caused by the relatively soft middle section, is more conducive to insertion, does not affect the flexibility of the front part of the insertion tube, ensures the stability of the insertion of the nasal cavity or oral cavity section and the hand-held section can be guaranteed, improves the insertability of the laryngoscope, and facilitates the doctor's operation, shortening the time for inserting, examining, and diagnosing whether there are related diseases in the pharynx to reduce the patient's pain.

[0092] (3) Improvement on the traction spring tube:

[0093] The spring tube fixing sleeve at the tail of the traction spring tube is directly clamped in the clamping and positioning groove of the connecting plate 4 (formed by 90° bending) of the operating handle. When operating the traction steel wire rope in the traction spring tube, the spring tube fixing sleeve will not fall off from the clamping and positioning groove of the 90° connecting plate. However, when maintaining it, it only needs to be taken out from the clamping and positioning groove of the connecting plate, greatly facilitating the rapid development of the maintenance work and overcoming the drawback in the prior art that the traction spring tube is welded to the connecting plate of the operating handle and is not easily disassembled when subsequent maintenance is required.

[0094] Inspired by the above-described ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A soft and thin pharyngoscope insertion tube assembly, comprising an insertion tube frame, an angle traction unit and a sealing unit, The insertion tube skeleton comprises a spring tube (1), a braided mesh tube (2) and a polyurethane protective tube (4); the braided mesh tube (2) is sleeved on the outer circumference 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 spring tube (1) comprises a throat section (11), a nasal cavity or oral cavity section (12) and a hand-held section (13) which are integrally connected in sequence; The angle traction unit comprises a front connecting ring (3), a rear connecting ring (5) and a traction spring tube (6); the rear connecting ring (5) is sleeved on the outer periphery of the tail of the braided mesh tube (2); the traction spring tube (6) is arranged in the spring tube (1), and the tail is located outside the rear connecting ring (5); a sealing unit connected to the operating handle is arranged on the outer periphery of the rear connecting ring (5); Features: The front connecting ring (3) is a double-ring structure as a whole, and comprises an inner ring (31) and an annular platform (32) arranged on the outer periphery of the inner ring (31), and a part 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 connected to the spring tube (1) as a whole, and a traction spring tube positioning groove (33) is provided on the inner ring (31) and along its length direction, and 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 sleeved on the outer circumference of a portion of the braided mesh tube, and one end of the polyurethane protective tube (4) is located at the junction of the throat section (11) and the nasal cavity or oral section (12), and the other end is adjacent to the rear connecting ring (5) and is attached to the inner end surface of the rear connecting ring (5). A flexible protective tube (7) is provided on the remaining section of the inner ring (31) and the outer periphery of the braided mesh tube covering the throat section (11), and the softness of the flexible protective tube (7) is greater than that of the polyurethane protective tube (4).

2. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: The spring pitch P1 of the pharyngeal section (11) is equal to the spring pitch P2 of the nasal or oral section (12), and the spring pitch P2 of the nasal or oral section (12) is smaller than the spring pitch P3 of the handheld section (13).

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

4. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: The pores of the braided mesh tube on the outer periphery of the hand-held section (13) of the spring tube (1) are coated with polyurethane coating.

5. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: Two or four traction spring tubes (6) are arranged in the spring tube (1), the annular platform (32) is located in the middle of the inner ring (31) in the length direction, two symmetrically arranged or four equally divided traction spring tube positioning grooves (33) are arranged on the inner ring (31) along the length direction, and the head of each traction spring tube (6) is respectively embedded in the corresponding traction spring tube positioning groove (33).

6. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: When two symmetrically arranged traction spring tube positioning grooves (33) are provided on the inner ring (31) along its length direction, 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°; or when four cross-shaped traction spring tube positioning grooves (33) are provided on the inner ring (31) along its length direction, the axes of two oppositely arranged 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 pharyngoscope insertion tube assembly 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 pharyngoscope insertion tube assembly according to claim 2, characterized in that: The spring pitch P1 of the pharyngeal section (11) and the spring pitch P2 of the nasal or oral section (12) are both 1.7 mm to 2.2 mm, and the spring pitch P3 of the handheld section (13) is 2.2 mm to 2.8 mm.

9. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: The outer periphery of the polyurethane protective tube (4) is provided with a transparent polyurethane coating (8) for protecting the printed length mark.

10. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: The sealing unit comprises a sealing cone sleeve (9) and a sealing cone sleeve insert (10), wherein the sealing cone sleeve insert (10) is arranged on the outer periphery of a rear connecting seat (5) which is sealed and connected to an operating handle, and the sealing cone sleeve (9) is connected to the sealing cone sleeve insert (10). The rear connection seat (5) has a solder injection hole which is welded to the rear of the braided mesh tube (2) as one body, and the rear connection seat (5) is also provided with a sealing ring (51) which is sealed to the operating handle seat.

11. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: The joint between the flexible protective tube (7) and the polyurethane protective tube (4) is fixed by a binding wire, and the binding wire is also coated with medical epoxy glue.

12. The flexible thin pharyngoscope insertion tube assembly according to claim 1, characterized in that: The tail of the traction spring tube (6) is provided with a spring tube fixing sleeve (61) which is positioned and connected to the operating handle connecting plate, and the outer periphery of the spring tube fixing sleeve (61) is provided with a positioning step (611).

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