Can be used alone or in conjunction with a fiberoptic bronchoscope for difficult airway intubation

Abstract

The present invention provides an intubation device for difficult airways that can be used alone or in conjunction with a fiber bronchoscope. The device comprises an insertion guide rail, the insertion guide rail comprising a guide rail body in the form of an arc-shaped strip, the outer arc surface of the guide rail body circumferentially extending and having a T-shaped guide slot extending circumferentially through the circumferential ends of the guide rail body; the guide rail body also circumferentially extending and having a video channel extending circumferentially through the circumferential ends of the guide rail body, a transparent lens embedded in one end of the video channel; a tongue depressor connected to the end of the guide rail body corresponding to the embedded transparent lens, and an operating handle fixedly disposed on the inner arc surface of the other circumferential end of the guide rail body; and a guide line extending to both ends is engraved on the bottom wall of the T-shaped guide slot. The device has a small overall thickness and can be used on difficult airway patients in various situations, such as those with small mouth openings.

Description

Technical Field

[0001] The present invention relates to the technical field of medical endoscopes, and in particular to a device for using an electronic video bronchoscope for tracheal intubation and laryngeal diagnosis and treatment, specifically an intubation device that can be used alone or in combination with a fiber bronchoscope for difficult airways. Background Art

[0002] Since the invention of the world's first laryngoscope in Caheza, Spain in 1855, various new laryngoscopes have continuously emerged. With technological advancements, the Glidescope video laryngoscope, invented by Saturn, Canada in 2001, revolutionized tracheal intubation and laryngeal diagnosis and treatment. Consequently, video laryngoscopes have rapidly gained widespread adoption and application worldwide. In clinical practice, anesthesiologists typically perform tracheal intubation before administering equipment such as anesthesia machines and ventilators. This involves inserting an endotracheal tube (endotracheal tube) into the patient's trachea to connect to the equipment. This intubation requires the support of intubation equipment, most commonly electronic video laryngoscopes. The physician uses the laryngoscope to expose the glottis and then insert the endotracheal tube behind the glottis. In most traditional laryngoscopes, the blade is directly connected to the handle and serves as the primary component, providing support and guiding or generating illumination.

[0003] However, because the various structural parameters of existing laryngoscopes and their accompanying blades are developed based on the anatomical characteristics of the average person's upper respiratory tract, the clinical practicality, safety, and reliability of the same video laryngoscope are significantly compromised when applied to patients with difficult airways, such as those with narrow pharyngeal stenosis, limited mouth opening, and inability to lean back. Because patients with difficult airways have limited mouth opening, video laryngoscopes and their accompanying blades are relatively large and have a large curvature, making it difficult to pass through the tongue root and raise the epiglottis. In some patients with limited mouth opening, the video laryngoscope cannot even be placed in the mouth, or even if it is barely inserted into the mouth, it still fails to expose the glottis or even the epiglottis. Therefore, the currently widely used video laryngoscopes are not satisfactory for tracheal intubation and laryngeal diagnosis and treatment of patients with difficult airways. Summary of the Invention

[0004] The present invention aims to provide an intubation device for difficult airways that can be used alone or in conjunction with a fiberoptic bronchoscope. The technical problem to be solved is that for patients with narrow oropharyngeal stenosis, patients with limited mouth opening, and patients with limited back leaning, if a fiberoptic bronchoscope or an endotracheal tube cannot be inserted through the nasopharynx (such as patients with nasopharyngeal carcinoma or those with epistaxis or easily damaged and bleeding nasal mucosa) and thus can only be intubated through the mouth, conventional video laryngoscopes and the laryngoscope blades used therewith are relatively large in size and have a large curvature, resulting in the laryngoscope blades being unable to pass through the tongue base and lift the epiglottis. In some patients with limited mouth opening, the videolaryngoscope cannot even be inserted into the mouth, or even if it is barely inserted into the mouth, it cannot expose the glottis or even the epiglottis. Therefore, an airway can only be established using a difficult airway instrument such as a fiberoptic bronchoscope. However, for such patients, especially those with limited back leaning, the fiberoptic bronchoscope is soft and cannot withstand the force, so it cannot pass through the tongue base to expose the glottis or even the epiglottis, and it often slips into the esophagus, resulting in intubation failure.

[0005] To solve the above technical problems, the present invention provides an intubation device for difficult airways that can be used alone or in conjunction with a fiberoptic bronchoscope. The device comprises an insertion guide rail, wherein the insertion guide rail comprises a guide rail body in the form of an arc-shaped strip, and a T-shaped guide slot extending circumferentially from an outer arc surface of the guide rail body and penetrating both circumferential ends of the guide rail body is provided.

[0006] The guide rail body is also provided with a video channel extending circumferentially and penetrating through both ends of the guide rail body. The video channel is arranged axially parallel to the T-shaped guide slot on the guide rail body, and a transparent lens is embedded in one end of the video channel.

[0007] A tongue depressor is connected to one end of the guide rail body corresponding to the embedded transparent lens, and the thickness of the tongue depressor is the same as the thickness of the bottom wall of the guide rail body corresponding to the bottom of the T-shaped guide slot. An operating handle is fixedly provided on the inner arc surface of the other circumferential end of the guide rail body;

[0008] A guide line extending to both ends is engraved on the bottom wall of the T-shaped guide slot.

[0009] The central axis of the operating handle is perpendicular to the chord line of the guide rail body.

[0010] Preferably: it also includes an insertion catheter, which includes a tube body bent in the shape of an arc segment and an arc-shaped plug-in plate integrally formed and connected to the radial inner side of the arc of the tube body, the arc-shaped plug-in plate protruding from the tube body on both sides in the axial direction, the cross-sectional outer contour of the insertion catheter is T-shaped, the inner diameter of the arc on the arc-shaped plug-in plate matches the outer diameter of the arc at the bottom of the T-shaped guide slot on the guide rail main body, the cross-sectional outer contour of the arc-shaped plug-in plate matches the shape and size of the cross-sectional contour of the T-shaped guide slot, the corresponding axial width of the tube body matches the corresponding axial width of the notch of the T-shaped guide slot, the insertion catheter is detachably inserted in the T-shaped guide slot, and the arc length of the tube body is greater than the arc length of the guide rail main body.

[0011] Preferably, the overall contour of the inner tube hole of the tube body is square, the tube wall on the tube body corresponding to the radial outer side of the arc is composed of two flexible baffles with overlapping edges, the opposite side edges of the two flexible baffles are respectively connected to the two side tube walls on the tube body corresponding to the axial direction, the two flexible baffles are respectively connected to the one side edge of the corresponding tube wall corresponding to the radial outer side of the arc, the two flexible baffles are respectively perpendicular to the corresponding tube walls, the length of the two flexible baffles is adapted to the length of the tube body, and the width of the two flexible baffles is smaller than the width between the two side tube walls on the tube body corresponding to the axial direction and larger than half of the width between the two side tube walls.

[0012] Preferably: an inclined guide surface is provided on one end of the guide rail body connected to the tongue depressor, an insertion end surface matching the inclination angle of the guide surface is also provided on the corresponding end of the insertion tube, and limit stops are provided on both sides of the other end of the insertion tube corresponding to the insertion end surface, and the limit stops abut against one end of the guide rail body where the operating handle is provided, so that the insertion end surface and the guide surface are on the same plane; the outer surface corners of the guide rail body and the insertion tube are both provided with a chamfered structure.

[0013] Preferably, the tongue depressor corresponds to a circumferentially extending structure of the bottom wall of the guide rail body corresponding to the bottom of the T-shaped guide slot, or the lower side of the tongue depressor is tangent to the inner arc surface of the guide rail body.

[0014] Preferably, the tongue depressor is hinged on one circumferential end of the guide rail body, and a threading channel is provided on one side of the guide rail body near the inner arc surface, one end of the threading channel extends circumferentially to pass through one circumferential end of the operating handle provided on the guide rail body, and the other end of the threading channel extends circumferentially to the end close to the hinged tongue depressor and then deflects radially inward to pass through the inner arc surface of the guide rail body, and a pull wire is passed through the threading channel, one end of the pull wire is connected to the lower side surface of the tongue depressor and deviates from the hinge axis between the tongue depressor and the guide rail body, and an L-shaped pull wire lever is provided on the operating handle, and the corner part of the L-shaped pull wire lever is hinged on one side of the operating handle, and the other end of the pull wire is connected to one end of the short arm of the L-shaped pull wire lever, and a clamp structure is formed between the long arm of the L-shaped pull wire lever and the operating handle.

[0015] Preferably, a flexible covering sheet is connected to the lower side of the tongue depressor, the flexible covering sheet is attached to the lower side of the tongue depressor, and the connection point between the pull wire and the tongue depressor, the hinge gap between the tongue depressor and the guide rail body, and the through hole formed by the threading channel on the inner arc surface of the guide rail body are all covered under the flexible covering sheet.

[0016] Preferably, the axial width of the guide rail body is 10-20 mm, the radial thickness of the guide rail body is 3-6 mm, the chord length of the guide rail body is 70-140 mm, the bow height of the guide rail body is 8-20 mm, the arc length of the insertion catheter exceeds the arc length of the guide rail body by more than 30 mm, the axial width of the slot corresponding to the T-shaped guide slot is 4-11 mm, the thickness of the bottom wall of the slot corresponding to the T-shaped guide slot on the guide rail body is 1-2 mm, the aperture of the video channel is 2-4 mm, the radial thickness of the insertion catheter is the same as the axial width of the slot corresponding to the T-shaped guide slot, and the side length of the square inner tube hole in the tube body is 3-9 mm.

[0017] Preferably, it also includes a video soft mirror, which includes a control display screen, a soft mirror body and a video probe connected in sequence. The video probe can pass through the video channel. The video probe consists of a camera and a light source. The outer diameter of the video probe is 2-4mm, and the video probe can be pulled out and inserted into the video channel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The overall thickness is small and can be used on various difficult airway patients with limited mouth opening, limited back movement, etc.

[0020] 2. The video channel can be used with a matching video soft mirror or traditional laryngoscope. The T-shaped guide slot on the insertion guide rail can be used alone with an endotracheal tube, or with a fiber bronchoscope under the guidance of the T-shaped guide slot and the guide line at the bottom of the slot. The structure is lighter and thinner, and the usage is more flexible and diversified.

[0021] 3. The insertion catheter can provide a guide channel for a fiber bronchoscope or an endotracheal tube. After the fiber bronchoscope enters the vicinity of the epiglottis to expose the glottis, the fiber bronchoscope can break through the two flexible baffles and detach from the inner tube hole of the tube body, thereby separating the insertion catheter from the insertion guide rail and then inserting the endotracheal tube. It is convenient to use and flexible to operate.

[0022] 4. The tongue depressor can also be controlled to hook inwards by the pull-wire lever on the operating handle, which helps to expose the patient's glottis.

[0023] The present invention can divide the action of inserting an endotracheal tube into two steps. First, the guide rail body is inserted. The tongue depressor at the front end of the guide rail body can lift the tongue root, open a channel to expose the epiglottis or part of the epiglottis, and then, under the guidance of the insertion catheter, the fiber bronchoscope is inserted near the epiglottis to prevent it from sliding into the esophagus, thereby smoothly exposing the glottis. Then, the insertion catheter is withdrawn and the endotracheal tube is inserted. For some cases where the glottis can be exposed when the guide rail body is inserted, the endotracheal tube can be directly inserted under the guidance of the T-shaped guide slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the three-dimensional structure of the insertion guide rail according to the first embodiment of the present invention.

[0025] Figure 2 It is a schematic cross-sectional structural diagram of embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic diagram of the three-dimensional decomposition structure of embodiment 2 of the present invention.

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the assembled state of embodiment 2 of the present invention.

[0028] Figure 5 It is a schematic cross-sectional structural diagram of the combined state of the insertion guide rail and the insertion catheter of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the video soft mirror of the present invention.

[0030] Figure 7 This is a schematic cross-sectional structural diagram of the combined state of the insertion guide rail and the video soft mirror of the present invention.

[0031] Figure 8 It is a schematic diagram of the hinged structure of the tongue depressor and the guide rail body of the present invention.

[0032] Figure 9 It is a schematic diagram of a partial cross-sectional structure of embodiment 3 of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the attached Figure 1-9 The preferred embodiment further describes in detail the intubation device for difficult airways proposed by the present invention, which can be used alone or in combination with a fiber bronchoscope.

[0034] Example 1: Figure 1-2 As shown in, an intubation device that can be used alone for a difficult airway comprises an insertion guide rail 1, wherein the insertion guide rail 1 comprises a guide rail body 11 in the form of an arc-shaped strip, wherein the width of the guide rail body 11 in the axial direction is 12 mm, and the radial thickness of the guide rail body 11 is 4 mm. A T-shaped guide slot 12 is provided on the outer arc surface of the guide rail body 11, with both ends respectively passing through the circumferential ends of the guide rail body 11. The bottom width of the T-shaped guide slot 12 is 7.5 mm, and the corresponding axial width of the notch of the T-shaped guide slot is 5.5 mm. A video channel 14 is also provided on the guide rail body 11, which extends circumferentially and passes through the circumferential ends of the guide rail body 11. The video channel 14 is axially arranged in parallel with the T-shaped guide slot 12 on the guide rail body 11. A transparent lens 141 is embedded in one port of the video channel 14, and the inner diameter of the video channel 14 is 3 mm; a tongue depressor 3 is connected to the end of the guide rail body 11 corresponding to the embedded transparent lens, and the thickness of the tongue depressor 3 is the same as the thickness of the bottom wall of the groove corresponding to the bottom of the T-shaped guide slot 12 on the guide rail body 11, both of which are 1.5 mm. The tongue depressor 3 corresponds to a circumferentially extending structure of the bottom wall of the groove corresponding to the bottom of the T-shaped guide slot 12 on the guide rail body 11, or the lower side surface of the tongue depressor 3 is tangent to the inner arc surface of the guide rail body 11, thereby forming a downward hook structure, and an operating handle 13 is fixedly provided on the inner arc surface at the other circumferential end of the guide rail body 11, and the central axis of the operating handle 13 is perpendicular to the chord of the guide rail body 11.

[0035] In the specific implementation process of this embodiment, Figure 1 、 2 As shown in ,7, the insertion guide rail 1 can be combined Figure 8The video soft mirror 4 shown in the figure is used alone in conjunction with an endotracheal tube. First, the video soft mirror 4 or other laryngoscopes that match the video channel 14 are inserted into the video channel 14, and the operating handle 13 is operated to insert the guide rail body 11 into the patient's mouth. Under the visual guidance of the video soft mirror 4 or laryngoscope, the tip of the epiglottis is reached to expose the glottis, and then the endotracheal tube is inserted into the trachea along the T-shaped guide slot.

[0036] Example 2: Figure 1-7 As shown, an intubation device for difficult airways used in conjunction with a fiber bronchoscope comprises an insertion guide rail 1 and an insertion catheter 2, wherein the insertion guide rail 1 comprises a guide rail body 11 in the form of an arc-shaped strip, the guide rail body 11 having an axial width of 12 mm and a radial thickness of 4 mm, a T-shaped guide slot 12 is provided on the outer arc surface of the guide rail body 11, and two ends thereof respectively pass through the circumferential ends of the guide rail body 11, the groove bottom width of the T-shaped guide slot 12 is 7.5 mm, and the corresponding axial width of the notch of the T-shaped guide slot is 5.5 mm, and a video channel 14 is further provided on the guide rail body 11, which passes through the circumferential ends of the guide rail body 11, and the video channel 14 is axially arranged side by side with the T-shaped guide slot 12 on the guide rail body 11, and a transparent lens 141 is embedded in one end of the video channel 14. The inner diameter of the video channel 14 is 3 mm; a tongue depressor 3 is connected to the end of the guide rail body 11 corresponding to the embedded transparent lens, and the thickness of the tongue depressor 3 is the same as the thickness of the bottom wall of the groove corresponding to the bottom of the T-shaped guide slot 12 on the guide rail body 11, both of which are 1.5 mm. The tongue depressor 3 corresponds to a circumferential extension of the bottom wall of the groove corresponding to the bottom of the T-shaped guide slot 12 on the guide rail body 11, or the lower side of the tongue depressor 3 is tangent to the inner arc surface of the guide rail body 11, thereby forming a downward hook structure, and a guide mark 121 extending to both ends is engraved on the bottom wall of the groove of the T-shaped guide slot 12. The guide mark 121 is preferably set to blue so that it is easier to identify in the oral cavity. An operating handle 13 is fixedly provided on the inner arc surface at the other circumferential end of the guide rail body 11, and the central axis of the operating handle 13 is perpendicular to the chord of the guide rail body 11;

[0037] The insertion catheter 2 includes a tube body 21 bent into an arc segment shape and an arc-shaped plug-in plate 22 integrally formed and connected to the radial inner side of the arc of the tube body 21. The arc-shaped plug-in plate 22 protrudes from the tube body 21 on both sides in the axial direction, and the protruding length is 1mm. The cross-sectional outer contour of the insertion catheter 2 is T-shaped. The inner diameter of the arc on the arc-shaped plug-in plate 22 matches the outer diameter of the arc at the bottom of the T-shaped guide slot 12 on the guide rail body 11. The cross-sectional outer contour of the arc-shaped plug-in plate 22 is T-shaped. The shape and size of the cross-sectional profile of the T-shaped guide slot 12 match, the thickness of the arc-shaped plug-in plate 22 is 1 mm, the corresponding axial width of the tube body 21 matches the corresponding axial width of the notch of the T-shaped guide slot 12, the corresponding radial thickness of the insertion catheter 2 is 5.5 mm, and the insertion catheter 2 is detachably inserted in the T-shaped guide slot 12. The arc length of the tube body 21 exceeds the arc length of the guide rail body 11 by more than 30 mm, and the extended part makes it easier for medical staff to hold the insertion catheter 2.

[0038] During the specific implementation of this embodiment, after the guide rail body 11 is inserted separately, when the tip of the epiglottis can be exposed under the observation of the video soft mirror 4 or the laryngoscope, the fiber bronchoscope can be inserted from the T-shaped guide slot 12, and the fiber bronchoscope can enter the vicinity of the epiglottis under the guidance of the guide mark 121 to expose the glottis, and then the tracheal intubation tube is inserted into the trachea along the T-shaped guide slot 12 and under the observation of the fiber bronchoscope; and when the patient's backward leaning degree is limited and the fiber bronchoscope is blocked by the root of the tongue and cannot pass through, the insertion catheter 2 is inserted into the T-shaped guide slot 12, and the tube body 21 of the insertion catheter 2 can lift the tongue, and its inner tube hole 23 forms a channel, and the fiber bronchoscope can be inserted through the inner tube hole 23 to the vicinity of the epiglottis to avoid slipping into the esophagus and expose the glottis, and then the insertion catheter 2 can be pulled out to insert the tracheal intubation tube.

[0039] Example 3: Figure 8-9As shown, on the basis of embodiments one and two, the tongue depressor 3 is hinged at one circumferential end of the guide rail body 11, and a threading hole 15 is provided on one side of the guide rail body 11 close to the inner arc surface. The inner diameter of the threading hole 15 is 0.5 mm, and one end of the threading hole 15 extends circumferentially to the circumferential end of the operating handle 13 provided on the guide rail body 11, and the other end of the threading hole 15 extends circumferentially to the end close to the hinged end of the tongue depressor 3 and then deflects radially inward to pass through the inner arc surface of the guide rail body 11. A pull wire 31 is passed through the threading hole 15. The diameter of the pull wire 31 matches the threading channel 15. The pull wire 31 is preferably a steel wire. One end of the pull wire 31 is connected to the lower side of the tongue depressor 3 and deviates from the hinge axis 32 between the tongue depressor 3 and the guide rail body 11. The operating handle 13 is provided with an L-shaped pull wire lever 33. The corner portion of the L-shaped pull wire lever 33 is hinged to one side of the operating handle 13. The other end of the pull wire 31 is connected to the L-shaped pull wire lever 33 at one end of the short arm 331. The long arm 332 of the L-shaped pull wire lever 33 forms a clamping structure with the operating handle 13.

[0040] In addition, a flexible covering sheet 34 is connected to the lower side of the tongue depressor 3. The flexible covering sheet 34 can be a thin sheet of rubber or latex material. The flexible covering sheet 34 is attached to the lower side of the tongue depressor 3, and the connection point between the pull wire 31 and the tongue depressor 3, the hinge gap between the tongue depressor 3 and the guide rail body 11, and the through hole formed by the threading channel 15 on the inner arc surface of the guide rail body 11 are all covered under the flexible covering sheet 34, so that when the pull wire 31 is subjected to force to pull the tongue depressor 3, the tension string formed by the pull wire 31 between the tongue depressor 3 and the guide rail body 11 can be blocked by the flexible covering sheet 34, so as not to cut the flesh tissue in the patient's throat.

[0041] During the specific implementation of this embodiment, the pull wire 31 can be pulled by the pull wire lever 33, thereby linking the tongue depressor 3 to perform a downward hooking action, so that the glottis is smoothly exposed.

[0042] Further, if Figure 3 、 4As shown in , 5, in the above embodiment, the overall contour of the inner tube hole 23 of the tube body 21 is square, the side length of the inner tube hole is 3.5 mm, and the tube wall corresponding to the radial outer side of the arc on the tube body 21 is composed of two flexible baffles 24 with overlapping edges, and the opposite side edges of the two flexible baffles 24 are respectively connected to the two side tube walls corresponding to the axial direction of the tube body 21, and the two flexible baffles 24 are respectively connected to the one side edge of the corresponding tube wall corresponding to the radial outer side of the arc, and the two flexible baffles 24 are respectively perpendicular to the corresponding tube walls, and the length of the two flexible baffles 24 is adapted to the length of the tube body 21. The width of the two flexible baffles 24 is less than the width between the two side tube walls of the tube body 21 corresponding to the axial direction and greater than half of the width between the two side tube walls, and the thickness of the two flexible baffles 24 is 0.2-0.5 mm. The semi-open structure of the inner tube hole 23 allows the fiber bronchoscope or endotracheal tube to break through the two flexible baffles 24 in a relatively radial direction and detach from the inner tube hole 23 of the tube body 21 after reaching a predetermined position, so that the insertion catheter 2 can be used as a sheath tube. After completing its corresponding work content, it can be separated and pulled out from the insertion guide rail 1 alone, which is convenient to use and flexible to operate.

[0043] Again, such as Figure 1 、 2 , 4, 8, 9, the guide rail body 11 is provided with an inclined guide surface 16 at one end thereof connected to the tongue depressor 3, and the corresponding end of the insertion conduit 2 is also provided with an insertion end surface 25 that matches the inclination angle of the guide surface 16, and the two sides of the other end of the insertion conduit 2 corresponding to the insertion end surface 25 are provided with limited stoppers 26 (as shown in FIG. Figure 2 、 6 As shown in FIG ), when the limit stopper 26 abuts against one end of the guide rail body 11 on which the operating handle 13 is provided, the insertion end surface 25 and the guide surface 16 are coplanar, forming a wedge-shaped head insertion structure; the outer surfaces of the guide rail body 11 and the insertion catheter 2 are provided with rounded corners to prevent the corners from damaging or scratching the tissues of the patient's mouth and throat.

[0044] like Figure 6 、 7 As shown, it also includes a video soft mirror 4, which includes a control display screen 41, a soft mirror body 42 and a video probe 43 connected in sequence. The video probe 43 can pass through the video channel 14. The video probe 43 is composed of a camera 431 and a light source 432. The outer diameter of the video probe 43 is 2.4 mm. The video probe 43 can be pulled out and inserted into the video channel 14.

[0045] In summary, the technical solution of the present invention can fully and effectively achieve the above-mentioned invention objectives, and the structural principles and functional principles of the present invention have been fully verified in the embodiments, and can achieve the expected effects and purposes. The embodiments of the present invention can also be modified according to these principles. Therefore, the present invention includes all replacement contents within the scope mentioned in the scope of the patent application. Any equivalent changes made within the scope of the patent application of the present invention are within the scope of the patent application of this case.

Claims

1. An intubation device that can be used alone or in conjunction with a fiberoptic bronchoscope for difficult airway intubation, characterized by: The insert guide rail comprises a guide rail body in the form of an arc-shaped strip, and a T-shaped guide slot extending circumferentially from an outer arc surface of the guide rail body and penetrating through both circumferential ends of the guide rail body; The guide rail body is also provided with a video channel extending circumferentially and penetrating through both ends of the guide rail body. The video channel is arranged axially parallel to the T-shaped guide slot on the guide rail body, and a transparent lens is embedded in one end of the video channel. A tongue depressor is connected to one end of the guide rail body corresponding to the embedded transparent lens, and the thickness of the tongue depressor is the same as the thickness of the bottom wall of the guide rail body corresponding to the bottom of the T-shaped guide slot. An operating handle is fixedly provided on the inner arc surface of the other circumferential end of the guide rail body; A guide line extending to both ends is engraved on the bottom wall of the T-shaped guide slot, and the guide line is set to blue; The tongue depressor is hinged on one circumferential end of the guide rail body, and a threading channel is opened on one side of the guide rail body near the inner arc surface, the inner diameter of the threading channel is 0.5mm, one end of the threading channel extends circumferentially to pass through one circumferential end of the operating handle set on the guide rail body, and the other end of the threading channel extends circumferentially to the end close to the hinged tongue depressor and then deflects radially inward to pass through the inner arc surface of the guide rail body, a pull wire is passed through the threading channel, one end of the pull wire is connected to the lower side surface of the tongue depressor and deviates from the hinge axis between the tongue depressor and the guide rail body, an L-shaped pull wire lever is provided on the operating handle, the corner part of the L-shaped pull wire lever is hinged on one side of the operating handle, the other end of the pull wire is connected to one end of the short arm of the L-shaped pull wire lever, and a clamp structure is formed between the long arm of the L-shaped pull wire lever and the operating handle.

2. The intubation device for difficult airways according to claim 1, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: The guide rail body is a substantially parallelogram of the guide rails, and the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails, wherein the guide rails are configured to have a substantially parallelogram of the guide rails 3. The intubation device for difficult airways according to claim 2, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: The overall contour of the inner tube hole of the tube body is square, and the tube wall on the tube body corresponding to the radial outer side of the arc is composed of two flexible baffles with overlapping edges, and the opposite side edges of the two flexible baffles are respectively connected to the two side tube walls of the tube body corresponding to the axial direction, and the two flexible baffles are respectively connected to the one side edge of the corresponding tube wall corresponding to the radial outer side of the arc, and the two flexible baffles are respectively perpendicular to the corresponding tube walls, and the length of the two flexible baffles is adapted to the length of the tube body, and the width of the two flexible baffles is smaller than the width between the two side tube walls of the tube body corresponding to the axial direction and larger than half of the width between the two side tube walls.

4. The intubation device for difficult airways according to claim 3, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: An inclined guide surface is provided on one end of the guide rail body connected to the tongue depressor, and an insertion end surface matching the inclination angle of the guide surface is also provided on the corresponding end of the insertion tube. Limit blocks are provided on both sides of the other end of the insertion tube corresponding to the insertion end surface. When the limit blocks abut against one end of the guide rail body where the operating handle is provided, the insertion end surface and the guide surface are on the same plane; the outer surface corners of the guide rail body and the insertion tube are both provided with chamfered structures.

5. The intubation device for difficult airways according to claim 4, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: The tongue depressor corresponds to a structure on the guide rail body that extends circumferentially from the bottom wall of the groove corresponding to the bottom of the T-shaped guide slot, or the lower side of the tongue depressor is tangent to the inner arc surface of the guide rail body.

6. The intubation device for difficult airways according to claim 5, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: A flexible covering sheet is connected to the lower side of the tongue depressor, and the flexible covering sheet is attached to the lower side of the tongue depressor. The connection point between the pull wire and the tongue depressor, the hinge gap between the tongue depressor and the guide rail body, and the through hole formed by the threading channel on the inner arc surface of the guide rail body are all covered under the flexible covering sheet.

7. The intubation device for difficult airways according to claim 6, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: The axial width of the guide rail body is 10-20 mm, the radial thickness of the guide rail body is 3-6 mm, the chord length of the guide rail body is 70-140 mm, the bow height of the guide rail body is 8-20 mm, the arc length of the insertion catheter exceeds the arc length of the guide rail body by more than 30 mm, the axial width of the slot corresponding to the T-shaped guide slot is 4-11 mm, the thickness of the bottom wall of the slot corresponding to the T-shaped guide slot on the guide rail body is 1-2 mm, the aperture of the video channel is 2-4 mm, the radial thickness of the insertion catheter is the same as the axial width of the slot corresponding to the T-shaped guide slot, and the side length of the square inner tube hole in the tube body is 3-9 mm.

8. The intubation device for difficult airways according to claim 7, which can be used alone or in conjunction with a fiberoptic bronchoscope, is characterized in that: It also includes a video soft mirror, which includes a control display screen, a soft mirror body and a video probe. The video probe can pass through the video channel. The video probe consists of a camera and a light source. The outer diameter of the video probe is 2-4 mm.

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