Visual laryngoscope

Abstract

The application relates to the technical field of medical devices, and provides a visual laryngoscope, which comprises a handle main body, a front end support connected to the distal end of the handle main body, a first expansion member and a second expansion member which are respectively hinged to the front end support and each comprise a support base body and a flexible buffer layer, a driving assembly arranged on the handle main body, and a transmission mechanism connecting the driving assembly and the two expansion members, wherein the transmission mechanism converts power into synchronous reverse deflection movements of the two expansion members around respective hinged shafts in response to the driving of the driving assembly to realize bidirectional expansion of a target cavity. The application realizes bidirectional flexible expansion of a pharyngeal cavity and noninvasive clear exposure of a glottis, and improves the success rate and safety of difficult airway intubation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a video laryngoscope. Background Technology

[0002] In clinical anesthesia, emergency care, and intensive care, endotracheal intubation is a crucial technique for establishing artificial airways. However, when faced with difficult airways such as limited mouth opening, thickened tongue, or drooping epiglottis, traditional video laryngoscopes generally employ a one-piece rigid lens structure, allowing only unidirectional, rigid prying by the operator applying leverage. This structure cannot independently and controllably elevate the drooping epiglottis or push aside the thickened tongue base, resulting in insufficient exposure of the glottis. Simultaneously, the rigid lens creates rigid contact and point pressure with the delicate pharyngeal mucosa, easily causing mucosal tears, tooth damage, and postoperative sore throat. Furthermore, thickened soft tissue often adheres directly to the front of the lens, obstructing the camera's view, forcing the operator to perform blind probes with unclear visibility, increasing the risk of intubation. Therefore, there is an urgent need for a video laryngoscope that can adapt to difficult airways, avoid tissue damage, and provide a clear view. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a video laryngoscope that addresses the problems of existing rigid video laryngoscopes, such as easy tissue damage from one-way prying, easy obstruction of the field of view, and difficulty in adapting to difficult airways. This application provides a video laryngoscope that achieves bidirectional flexible expansion of the pharynx and non-invasive, clear exposure of the glottis.

[0004] To achieve the above objectives, the present invention provides a video laryngoscope, comprising:

[0005] handle body;

[0006] A front support component is connected to the distal end of the handle body;

[0007] The first expansion member and the second expansion member are respectively hinged to the front end support member via hinge shafts. Both the first expansion member and the second expansion member include a support base that provides expansion stiffness and a flexible buffer layer covering the outer surface of the support base.

[0008] A drive component is disposed on the handle body;

[0009] And a transmission mechanism, connected between the drive assembly and the first expansion member and the second expansion member;

[0010] The transmission mechanism is configured to, in response to the drive of the drive component, convert the power output by the drive component into opposite deflection motions of the first expansion member and the second expansion member about their respective hinge axes, so as to achieve bidirectional expansion of the target cavity.

[0011] Preferably, the supporting substrate is made of a rigid material, and the flexible buffer layer is made of a medical-grade flexible material;

[0012] The human contact edges of both the first and second expansion members have a rounded, blunt structure.

[0013] Preferably, the transmission mechanism includes:

[0014] An axial sliding member is slidably disposed along the axial direction of the handle body;

[0015] And a connecting rod assembly, connected between the axial sliding member and the first expansion member and the second expansion member;

[0016] The axial sliding member is configured to move axially under the drive of the drive assembly, and to push the first expansion member and the second expansion member to rotate synchronously in opposite directions about their respective hinge axes via the linkage assembly.

[0017] Preferably, the axial sliding member includes a hollow rod body, which is horizontally slidably installed inside the handle body;

[0018] The linkage assembly includes two transmission push rods symmetrically arranged within the front end support member, and two connecting rods corresponding to the two transmission push rods respectively;

[0019] Both the first expansion member and the second expansion member are provided with sliding fit grooves;

[0020] One end of each of the transmission push rods abuts against the hollow rod body, and the other end is hinged to the corresponding sliding groove through the corresponding connecting rod.

[0021] The transmission mechanism further includes a hinge rod, which connects the output end of the drive assembly to the end of the hollow rod.

[0022] When the transmission push rod moves axially, it drives the corresponding first expansion member or second expansion member to deflect through the sliding hinge engagement of the connecting rod in the sliding groove.

[0023] The transmission mechanism further includes a first reset elastic element, configured to provide a reset pull force for the axial sliding element and the transmission push rod.

[0024] Preferably, the driving component includes:

[0025] An electric linear actuator is fixed inside the handle body, and its output end is connected to the transmission mechanism.

[0026] The control buttons are located on the surface of the handle body and electrically connected to the electric linear actuator, and are used to control the start, stop and extension stroke of the electric linear actuator.

[0027] Preferably, the driving component includes:

[0028] The guide shaft is fixed inside the handle body;

[0029] A sliding connecting seat is slidably mounted on the guide shaft and connected to the transmission mechanism;

[0030] A locking pin is slidably installed within the sliding connecting seat;

[0031] The pressing operation part is fixed to the locking pin and extends to the outside of the handle body;

[0032] And multiple positioning grooves, which are equidistantly opened on the handle body along the sliding trajectory of the pressing operation part;

[0033] The locking pin is configured to be selectively inserted into any of the positioning slots to lock the axial position of the sliding connecting seat;

[0034] The second elastic reset member is connected between the locking pin and the sliding connecting seat and is configured to provide an elastic force to the locking pin toward the positioning groove.

[0035] The side wall of the handle body is provided with a guide groove, and the pressing operation part is slidably installed in the guide groove;

[0036] A limiting block, fixed to the surface of the locking pin, is configured to selectively abut against the inner wall of the handle body to limit the extension stroke of the locking pin.

[0037] Preferably, the outer wall of the distal end of the handle body is provided with a quick-release guide groove, the quick-release guide groove including an axial section and a circumferential section communicating with the axial section;

[0038] The inner wall of the front support is provided with a guide pin, which is slidably installed in the quick-release guide groove.

[0039] The video laryngoscope also includes a locking ring and a locking pin. The locking ring is slidably sleeved on the handle body, and the locking pin is fixed to the locking ring.

[0040] The end face of the front support member is provided with a locking groove, and the locking pin is inserted into the locking groove;

[0041] The video laryngoscope also includes a third elastic pretensioner, which is sleeved on the handle body and connected at both ends to the locking ring and the handle body, respectively.

[0042] The third elastic preload is configured to provide a preload force to the locking ring toward the front support so that the locking pin remains inserted in the locking groove.

[0043] Preferably, the video laryngoscope further includes a visualization component, which includes an image acquisition unit and an illumination unit;

[0044] The visualization component is installed at the distal end of the hollow rod and configured to move synchronously to the distal end with the axial movement of the hollow rod to avoid soft tissue obstruction.

[0045] The image acquisition unit includes a wide-angle camera, and the illumination unit includes a ring-shaped light-emitting element arranged around the wide-angle camera;

[0046] The connecting line between the wide-angle camera and the ring-shaped light-emitting element is built into the hollow cavity of the hollow rod.

[0047] Preferably, the reverse deflection angles of the first expansion member and the second expansion member are both within the range of 0° to 30°;

[0048] The hinge shaft is a flexible damping hinge shaft, and the first expansion member and the second expansion member are respectively hinged to the front end support member through the flexible damping hinge shaft;

[0049] The flexible damping hinge shaft is configured to provide a damping torque, causing the deflection motion of the first expansion member and the second expansion member to be a progressive, flexible flip.

[0050] Preferably, the driving component includes two independent driving units, which are respectively connected to the first expansion member and the second expansion member;

[0051] Each of the drive units is configured to independently adjust the deflection angle of the corresponding first or second expansion member to achieve independent control of the vertical expansion amplitude.

[0052] The beneficial effects of this invention are as follows: Using a video laryngoscope of this invention, by setting up a first and second dilator that are hinged relative to each other, and utilizing a transmission mechanism to convert the power of the drive component into synchronous, opposite deflection movements of the two dilators, the traditional one-way rigid prying operation mode of video laryngoscopes is changed. After insertion, the first and second dilators can simultaneously and flexibly expand the upper and lower sides of the pharynx in opposite directions. On the one hand, the epiglottis can be selectively lifted or the tongue base pushed aside according to the patient's anatomical abnormalities, accurately exposing the glottis; on the other hand, the bidirectional expansion action simultaneously clears soft tissue obstructions located in front of the lens, avoiding blind probing operations and significantly improving the success rate and safety of intubation in difficult airways.

[0053] By employing a composite structure comprising a supporting matrix and a flexible buffer layer, the first and second expanders combine the rigidity required for expansion with the flexibility to contact tissue. The supporting matrix ensures the effective transmission of expansion force, preventing the narrow airway from being unable to open due to excessively soft material; the flexible buffer layer and rounded, blunt edges allow the expansion process to contact tissue gently and gradually, avoiding point pressure and hard friction. This fundamentally solves the problems easily caused by traditional rigid video laryngoscopes, such as mucosal tears, tooth damage, and postoperative sore throat, making it especially suitable for elderly or pediatric patients with fragile mucosa.

[0054] Through the cooperation of the axial sliding member and the connecting rod assembly, the linear displacement of the drive component is efficiently converted into the reverse angular displacement of the expander. This transmission mechanism is compact in structure and moves smoothly, enabling precise control of the expansion angle. Combined with the first reset elastic member, the expander can automatically close after the operation, facilitating non-invasive removal of the instrument. Furthermore, the design of the visualization component moving synchronously to the distal end with the transmission mechanism allows the camera and light source to actively move forward during expansion, further avoiding soft tissue that might rebound and obstruct the field of vision, ensuring a continuously clear and stable glottic image.

[0055] By offering both electric and manual drive options, the same video laryngoscope architecture can be adapted to diverse clinical scenarios. The electric drive allows for precise, tiered adjustments, suitable for elective settings such as operating rooms; the manual drive, combined with a multi-level positioning slot locking mechanism, enables stable, tiered expansion without a power source, making it particularly suitable for emergency environments such as emergency rooms, pre-hospital care, or power outages. Simultaneously, the quick-release guide groove and locking structure between the handle body and the front support component enable rapid separation and thorough sterilization of parts in contact with patient bodily fluids, effectively reducing the risk of cross-infection and improving the reusability and maintenance convenience of the instrument. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the overall structure of the video laryngoscope according to an embodiment of this application;

[0058] Figure 2 This is a right view of a video laryngoscope according to an embodiment of this application;

[0059] Figure 3 This is a schematic diagram of the disassembly structure of the video laryngoscope handle and support sleeve according to an embodiment of this application;

[0060] Figure 4This is an embodiment of the present application. Figure 3 Enlarged view of the structure at point A in the middle;

[0061] Figure 5 This is a left-side schematic diagram of the disassembly structure of the video laryngoscope handle and support sleeve according to an embodiment of this application;

[0062] Figure 6 This is an embodiment of the present application. Figure 5 Enlarged view of the structure at point B in the middle;

[0063] Figure 7 This is a left sectional view of the structure of the video laryngoscope handle, support sleeve, and hinge rod according to an embodiment of this application;

[0064] Figure 8 This is an embodiment of the present application. Figure 7 Enlarged view of the structure at point C;

[0065] Figure 9 This is a schematic diagram of the first and second expansion members opening structure according to an embodiment of this application;

[0066] Figure 10 This is a partial structural cross-sectional view of the video laryngoscope handle, press button, and hinge rod according to an embodiment of this application;

[0067] Figure 11 This is an embodiment of the present application. Figure 10 Enlarged view of the structure at point D;

[0068] Figure 12 This is a cross-sectional view of the locking structure connecting the handle and support sleeve of the video laryngoscope according to an embodiment of this application.

[0069] Figure 13 This is an embodiment of the present application. Figure 12 Enlarged view of the structure at point E in the middle.

[0070] The diagram is marked as follows:

[0071] 1. Handle body; 2. Front support; 3. First expansion member; 4. Second expansion member; 5. Hinge shaft; 6. Hollow rod; 7. Transmission push rod; 8. Connecting rod; 9. Sliding groove; 10. Hinge rod; 11. First reset elastic member; 12. Electric linear actuator; 13. Control button; 14. Guide shaft; 15. Sliding connecting seat; 16. Locking pin; 17. Pressing operation part; 18. Positioning groove; 19. Second elastic reset member; 20. Guide groove; 21. Limiting block; 22. Quick release guide groove; 23. Guide pin; 24. Locking ring; 25. Locking pin; 26. Locking groove; 27. Third elastic pre-tightening member; 28. Wide-angle camera; 29. ​​Ring light-emitting member. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0073] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0074] In a first aspect, the present invention provides a video laryngoscope, such as Figure 1-13 As shown, it includes:

[0075] handle body 1;

[0076] The front support 2 is connected to the distal end of the handle body 1. The handle body 1 serves as the operating grip and internal housing of the entire device, and has an axially extending chamber inside to accommodate the drive and transmission components. The front support 2 is connected to the distal end of the handle body 1 and serves as the mounting base for the front actuator. Its connection with the handle body 1 can be a fixed connection or a detachable connection to facilitate subsequent cleaning, disinfection, or replacement of front components of different specifications.

[0077] The first expansion member 3 and the second expansion member 4 are respectively hinged to the front support member 2 via the hinge shaft 5. Both the first expansion member 3 and the second expansion member 4 include a support base that provides expansion stiffness and a flexible buffer layer covering the outer surface of the support base.

[0078] The drive component is located on the handle body 1;

[0079] And a transmission mechanism, connected between the drive assembly and the first expansion member 3 and the second expansion member 4;

[0080] The transmission mechanism is configured such that, in response to the drive component, the power output by the drive component is converted into the opposite deflection motion of the first expander 3 and the second expander 4 around their respective hinge axes 5, thereby achieving bidirectional expansion of the target cavity. This bidirectional expansion configuration with two expanders distinguishes it from the traditional unidirectional rigid prying laryngoscope architecture. On one hand, the composite structure of the expanders, while ensuring expansion efficiency, completely eliminates the risk of point pressure on the fragile mucosa from rigid sharp edges, achieving truly non-invasive contact. On the other hand, the synchronous opposite deflection bidirectional expansion mechanism can push down the tongue base and pharyngeal lateral wall while lifting the epiglottis, actively clearing soft tissue obstructions located in front of the lens. This allows for a clear and stable glottic field of view without relying on excessive leverage, significantly improving the safety and success rate of difficult airway management.

[0081] In this embodiment: the supporting substrate is made of rigid material, and the flexible buffer layer is made of medical-grade flexible material; wherein, the first expander 3 and the second expander 4 are not made of simple soft material, but adopt a composite structure design of "rigid inside and flexible outside". The supporting substrate constitutes the mechanical skeleton of the expander, which has sufficient structural strength to withstand the reaction force from human tissue during the expansion process, ensuring that the expansion action can be effectively transmitted and maintain the predetermined expansion shape, avoiding buckling failure due to excessively soft material; the flexible buffer layer tightly covers the outer surface of the supporting substrate, especially covering all areas that may come into contact with human tissue, using its own elastic deformation ability to adapt to the irregular anatomical contour of the throat, and transforming concentrated mechanical stress into uniformly distributed surface contact pressure.

[0082] In addition, the front support 2 serves as the mounting base, and its main function is to provide structural support and connection positioning. Under normal use, it does not directly contact the airway mucosa. The flexible buffer layer on the surface of the first expander 3 and the second expander 4 is what actually comes into contact with human tissue, so as to avoid the potential risk of damage to the fragile mucosa by the rigid components.

[0083] The human contact edges of both the first expander 3 and the second expander 4 have a rounded, blunted structure. This rounded, blunted structure means that all boundaries, corners, and ends of the expander that may come into contact with human tissue are smoothly rounded, without any sharp protrusions, burrs, or right-angle turns. Compared to the often sharp edges of traditional video laryngoscopes, which easily create point or line pressure concentrations during prying, leading to tearing, bleeding, or even tooth damage of the fragile oropharyngeal mucosa, the rounded, blunted design significantly increases the contact area between the instrument and the tissue, dispersing concentrated mechanical force into a uniform surface load, thereby greatly reducing the pressure per unit area. Furthermore, the radius of the rounded edge at the human contact point can be set to be greater than or equal to 1.5 mm, the thickness of the flexible buffer layer can be controlled between 0.8 mm and 1.2 mm, and the Shore A hardness can be selected within the range of 30A to 40A to achieve the best buffering and energy absorption effect.

[0084] In this embodiment: the transmission mechanism includes:

[0085] An axial sliding member is slidably disposed along the axial direction of the handle body 1;

[0086] And a connecting rod assembly, which is connected between the axial sliding member and the first expansion member 3 and the second expansion member 4;

[0087] The axial sliding member is configured to move axially under the drive of the drive assembly, and push the first expansion member 3 and the second expansion member 4 to rotate synchronously in opposite directions around their respective hinge axes 5 via the linkage assembly.

[0088] In this embodiment: the axial sliding member includes a hollow rod 6, which is horizontally slidably installed inside the handle body 1;

[0089] The linkage assembly includes two transmission push rods 7 symmetrically arranged in the front support member 2, and two connecting rods 8 corresponding to the two transmission push rods 7 respectively;

[0090] Both the first expansion member 3 and the second expansion member 4 are provided with sliding grooves 9;

[0091] One end of each transmission push rod 7 abuts against the hollow rod body 6, and the other end is hinged to the corresponding sliding groove 9 through the corresponding connecting rod 8.

[0092] The transmission mechanism also includes a hinge rod 10, which is connected between the output end of the drive assembly and the end of the hollow rod 6;

[0093] When the hinge rod 10 is deflected at the output end of the drive assembly, the end of the hinge rod 10 that is hinged to the hollow rod 6 is pushed, and the hollow rod 6 moves horizontally inside the handle body 1. This causes the end of the hollow rod 6 away from the hinge rod 10 to push the transmission push rod 7 to move axially. Through the sliding hinge engagement of the connecting rod 8 in the sliding groove 9, the corresponding first expansion member 3 or second expansion member 4 is driven to deflect. Through the transmission mechanism, the single-degree-of-freedom linear displacement output by the drive assembly is converted into the opposite angular displacement of the two expansion members around their respective hinge axes 5. When the axial sliding member moves to the far end along the axis of the handle body 1 under the action of the driving force, it applies torques in opposite directions to the first expansion member 3 and the second expansion member 4 through the connecting rod assembly, thereby pushing them to open outward synchronously.

[0094] The transmission mechanism also includes a first reset elastic element 11, configured to provide a reset pulling force for the axial sliding member and the transmission push rod 7. The first reset elastic element 11 is a telescopic spring, wherein a reset spring is sleeved on the hollow rod 6, and a guide frame is slidably sleeved in the middle of the hollow rod 6. The two ends of the reset spring are respectively fixedly connected to the guide frame and the end of the hollow rod 6, and a limit ring is fixed on the surface of the hollow rod 6. The limit ring abuts against the guide frame on the side away from the reset spring, mainly used to overcome the frictional resistance of the hollow rod 6 itself and provide the main restoring force; the transmission push rod 7 is sleeved with a positioning sleeve, and the positioning sleeve is fixed on the inner wall of the front end support 2. The two ends of the first reset elastic element 11 are respectively fixedly connected to the positioning sleeve and the transmission push rod 7, specifically used to eliminate the gap between the connecting rod 8 and the sliding groove 9, and to provide an auxiliary restoring force for the closure of the front end expansion member. By employing a dual-stage reset mechanism, on the one hand, it avoids the problem of distal reset force attenuation that may result from relying solely on a single spring, ensuring that the front-end expansion member can obtain sufficient closing force even under long-stroke transmission; on the other hand, the independent pre-tightening force provided by the first reset elastic element 11 can effectively compensate for mechanical fit clearances, preventing the expansion member from shaking or getting stuck during the closing process, ensuring the streamlined shape of the device when it is withdrawn, and minimizing secondary stimulation to the patient's throat tissue.

[0095] In this embodiment: the driving component includes:

[0096] An electric linear actuator 12 is fixed inside the handle body 1, and its output end is connected to the transmission mechanism.

[0097] Control buttons 13 are provided on the surface of the handle body 1 and electrically connected to the electric linear actuator 12, used to control the start, stop and extension stroke of the electric linear actuator 12.

[0098] The electric linear actuator 12 preferably employs a low-speed miniature electric actuator, whose body is securely mounted on the inner side of the top or side wall of the L-shaped cavity of the handle body 1 to ensure the stability of the power output. A mounting base is fixed to the end of the output shaft of the electric linear actuator 12, which is hinged to one end of the hinge rod 10 in the transmission mechanism. When the electric linear actuator 12 is energized and extends, the linear displacement of its output shaft is transmitted to the hinge rod 10 through the mounting base, thereby pushing the hollow rod 6 to slide distally against the force of the return spring. The linkage assembly drives the first expansion member 3 and the second expansion member 4 to deflect synchronously in opposite directions. This mechatronic power transmission path eliminates the risk of vibration caused by uneven manual operation force, ensuring the smoothness and linearity of the expansion action. Furthermore, the electric linear actuator 12 can be configured to operate in a gentle thrust and slow extension mode, with its output speed controlled within a low range, such as 0.5 mm / s to 2 mm / s. This allows the deflection motion of the expander to exhibit a gradual propulsion characteristic, giving the human tissue sufficient time to adapt and avoiding the risk of tissue tearing or blood vessel rupture caused by instantaneous rapid expansion.

[0099] The control button 13 can be configured to support a graded adjustment mode, meaning the operator can precisely control the extension and retraction stroke and speed of the electric linear actuator 12 by short presses, long presses, or switching between multiple levels. For example, in a preferred control logic, each trigger of the control button 13 results in the electric linear actuator 12 performing only a preset small stroke, such as 0.5mm to 1mm, corresponding to an increment of approximately 1° to 2° in the deflection angle of the expander; alternatively, the control button 13 supports proportional control, where the pressing depth or frequency is proportional to the extension speed of the push rod. This graded control mechanism allows the operator to gradually expand the pharyngeal space in a "step-by-step" or "fine-tuning" manner based on the tissue morphology fed back from the real-time visual screen.

[0100] With its precise electric drive mode, the pharyngeal mucosa of patients with difficult airways is often extremely fragile due to pathological changes. Traditional manual operation struggles to accurately control the applied force, easily leading to mucosal tears or hematomas due to excessive instantaneous expansion force. However, the uniform, slow output characteristic of the electric linear actuator 12, combined with the graded, fine adjustment of the control buttons 13, discretizes the expansion process into multiple controllable micro-steps. This not only allows sufficient time for the tissue to undergo viscoelastic creep to adapt to deformation, avoiding acute damage caused by stress concentration, but also gives the operator the ability to immediately stop or retract when abnormal resistance is detected. Furthermore, the self-locking characteristic of the electric drive allows the expansion state to remain stable without continuous force application, reducing operator hand fatigue and allowing them to focus more on delicate procedures such as catheter insertion.

[0101] When using an electric precision dilatational laryngoscope, during the insertion of the upper and lower dilatation flaps, the electric linear actuator 12 is controlled by the control button 13 to be in the contracted state. The reset spring pushes the hollow rod 6 so that its limiting ring abuts against the guide frame. At this time, the transmission push rod 7 is in the retracted position under the action of the first reset elastic element 11. The first dilatation element 3 and the second dilatation element 4 are both in the closed 0° position, and the whole is slender and streamlined. The operator holds the handle of the video laryngoscope and inserts the tip non-invasively from the corner of the patient's mouth, gently guiding it along the tongue to the pharynx.

[0102] Once the tip of the video laryngoscope reaches the predetermined position, the operator presses control button 13 to activate the electric linear actuator 12, which slowly extends. The electric linear actuator 12, via the hinge rod 10, pushes the hollow rod 6 forward, overcoming the restoring spring force on its surface. Simultaneously, the end (conical sleeve) of the hollow rod 6 pushes two transmission push rods 7 forward. Through the cooperation of the connecting rod 8 and the sliding groove 9, the transmission push rods 7 drive the first expansion member 3 to flip upward and the second expansion member 4 to flip downward, achieving bidirectional reverse flexible expansion. The operator can adjust the expansion angle (0°-30°) in stages using control button 13 based on the real-time visual display on the video laryngoscope handle until the optimal glottal exposure field of view is obtained.

[0103] Guided by a clear field of vision, the operator accurately inserts the endotracheal tube into the glottis. After intubation, the electric linear actuator 12 is slowly retracted by controlling button 13. Each component resets under the action of the reset spring and the first reset elastic element 11, and the first dilator 3 and the second dilator 4 automatically close. Finally, the entire video laryngoscope is smoothly withdrawn from the patient's mouth, completing the operation. The electric drive is suitable for routine elective surgeries in operating rooms and ICUs.

[0104] In this embodiment: the driving component includes:

[0105] Guide shaft 14 is fixed inside handle body 1;

[0106] The sliding connecting seat 15 is slidably mounted on the guide shaft 14 and connected to the transmission mechanism;

[0107] Locking pin 16 is slidably installed in sliding connecting seat 15;

[0108] The pressing operation part 17 is fixed to the locking pin 16 and extends to the outside of the handle body 1;

[0109] And multiple positioning grooves 18 are equidistantly provided on the handle body 1 along the sliding trajectory of the pressing operation part 17;

[0110] The locking pin 16 is configured to be selectively inserted into either of the positioning slots 18 to lock the axial position of the sliding connecting seat 15;

[0111] The second elastic reset member 19 is connected between the locking pin 16 and the sliding connecting seat 15 and is configured to provide an elastic force toward the positioning groove 18 to the locking pin 16.

[0112] The guide shaft 14 is preferably a high-strength metal optical shaft, with both ends firmly supported on the inner wall of the handle body 1 cavity, ensuring that the sliding connecting seat 15 will not deviate or jam when subjected to large thrust. The sliding connecting seat 15 includes a connecting seat body and a connecting ear fixed to the side wall of the connecting seat body. The connecting ear is slidably mounted on the guide shaft 14, and the connecting ear has a receiving cavity inside. The locking pin 16 is horizontally inserted into the receiving cavity and is elastically connected to the inner wall of the sliding connecting seat 15 through the second elastic reset member 19, so that the locking pin 16 always maintains an outward pop-out tendency in its natural state, thereby tightly embedding into the current positioning groove 18 to achieve self-locking. The second elastic reset member 19 is a telescopic spring. The pressing operation part 17 serves as a human-machine interface, and its exposed end is designed with anti-slip texture or a fingertip-contact curved surface to improve friction and tactile feedback when operating with wet hands or wearing gloves. Multiple positioning slots 18 are arranged in a linear array along the axis of the guide shaft 14. The spacing between adjacent positioning slots 18 is precisely calculated to correspond to specific deflection angle increments of the first expansion member 3 and the second expansion member 4, such as an opening angle of 2° to 3° per level, thereby realizing discrete graded adjustment of the expansion state.

[0113] The side wall of the handle body 1 is provided with a guide groove 20, and the pressing operation part 17 is slidably installed in the guide groove 20;

[0114] A limiting block 21, fixed to the surface of the locking pin 16, is configured to selectively abut against the inner wall of the handle body 1 to limit the extension stroke of the locking pin 16. By setting the limiting block 21, when the sliding connecting seat 15 moves to the maximum safe travel end point, the limiting block 21 precisely abuts against the inner wall of the handle body 1, physically preventing further movement of the sliding connecting seat 15. This ensures operational safety and prevents damage to tissues or instruments due to excessive opening of the expander caused by misoperation.

[0115] When using a manual emergency expansion type video laryngoscope, in the initial state, the locking pin 16 is engaged in the positioning groove 18 at the top initial position under the action of the second elastic reset member 19, the sliding connecting seat 15 is locked, and the expansion piece is closed.

[0116] During expansion, the doctor pinches the pressing operation part 17 with their thumb and forefinger, overcoming the elastic force of the second elastic reset member 19 and pressing it into the sliding connecting seat 15, causing the locking pin 16 to disengage from the current positioning groove 18. Then, the pressing operation part 17 is pushed to slide up and down along the guide groove 20, causing the sliding connecting seat 15 and its locking pin 16 to move along the guide shaft 14. The sliding connecting seat 15 drives the hollow rod 6 to move through the hinge rod 10, achieving the same expansion plate action as in the above embodiment. When the desired expansion angle is reached, the pressing operation part 17 is released, and the locking pin 16 automatically springs into the corresponding positioning groove 18 under the action of the second elastic reset member 19, achieving position locking. By engaging the locking pin 16 in different positions of the positioning groove 18, graded and stable control of the expansion angle can be achieved. By using the locking pin 16 in conjunction with the multi-level positioning groove 18, graded manual adjustment and position locking can be achieved. This structure requires no power supply, is simple, intuitive, stable and reliable, and is particularly suitable for emergency situations such as emergency care, pre-hospital emergency care, and battlefield first aid. It can quickly establish an airway even in harsh or power-free environments. The manual locking drive is suitable for pre-hospital emergency care, emergency power outages, and emergency scenarios without power in the field.

[0117] This further enables a single device to be adapted to a wide range of clinical scenarios, from children to adults, and from mild anatomical abnormalities to severe airway difficulties (such as minimal mouth opening and severe pharyngeal stenosis). Medical institutions no longer need to stock multiple models and curvatures of traditional rigid lenses, thereby simplifying the preoperative preparation process and reducing equipment procurement and maintenance costs.

[0118] In this embodiment, a quick-release guide groove 22 is provided on the outer wall of the distal end of the handle body 1. The quick-release guide groove 22 includes an axial section and a circumferential section communicating with the axial section. It should be noted that the quick-release guide groove 22 has an overall L-shaped trajectory. Its axial section extends along the axis of the handle body 1, serving as an inlet channel for the guide pin 23. The circumferential section extends along the circumference of the handle body 1 and communicates with the end of the axial section, forming a locking structure to restrict the axial disengagement of the front support member 2. The guide pin 23 is symmetrically arranged on the inner wall of the front support member 2 near the end of the handle body 1, and its diameter precisely matches the groove width of the quick-release guide groove 22, ensuring smooth sliding while avoiding excessive radial wobble.

[0119] The inner wall of the front support 2 is provided with a guide pin 23, which is slidably installed in the quick-release guide groove 22;

[0120] The video laryngoscope also includes a locking ring 24 and a locking pin 25. The locking ring 24 is slidably sleeved on the handle body 1, and the locking pin 25 is fixed to the locking ring 24.

[0121] The end face of the front support member 2 has a locking groove 26, and the locking pin 25 is inserted into the locking groove 26. Specifically, the locking ring 24 is coaxially sleeved on the outer wall of the distal end of the handle body 1 and can slide axially within a certain stroke. The locking pin 25 protrudes radially inward along the locking ring 24, and its position precisely corresponds to the locking groove 26 on the end face of the front support member 2. When the guide pin 23 slides into the circumferential section of the quick-release guide groove 22, the locking pin 25 is precisely aligned with the locking groove 26 and inserted into it, thereby forming a second mechanical limit in the axial direction. This double locking, composed of the circumferential limit provided by the quick-release guide groove 22 and the axial limit provided by the locking pin 25, effectively resists the multidimensional loads that the video laryngoscope may bear during use, preventing the front support member 2 from accidentally falling off or rotating out of position.

[0122] The video laryngoscope also includes a third elastic pretensioner 27, which is sleeved on the handle body 1 and connected at both ends to a locking ring 24 and the handle body 1, respectively.

[0123] The third elastic preload 27 is configured to provide a preload force to the locking ring 24 toward the front support 2, so that the locking pin 25 remains inserted in the locking groove 26. The third elastic preload 27 is preferably a cylindrical helical compression spring, which is always in a compressed state and continuously applies an axial thrust toward the distal end to the locking ring 24. The mechanism of this preload is as follows: on the one hand, it forces the locking pin 25 to be tightly embedded in the bottom of the locking groove 26, eliminating the axial fit gap between the two and avoiding fretting wear and abnormal noise caused by instrument vibration or tissue reaction force; on the other hand, it also indirectly applies an axial clamping force to the front support 2 through the locking ring 24, so that the guide pin 23 is always in close contact with the bearing surface of the circumferential section of the quick-release guide groove 22, further enhancing the rigidity and stability of the connection.

[0124] The manual drive assembly employs a three-step operation: "press to unlock - slide to adjust - release to lock". When the expansion angle needs to be adjusted, the operator first presses the pressing operation part 17 with their finger to overcome the elastic force of the second elastic reset member 19, causing the locking pin 16 to completely exit from the current positioning groove 18, thus releasing the position lock of the sliding connecting seat 15. Subsequently, while maintaining the pressing state, the operator pushes the pressing operation part 17 along the guide groove 20, causing the sliding connecting seat 15 and the transmission mechanism connected to it to move synchronously, thereby driving the first expansion member 3 and the second expansion member 4 to deflect towards the target angle. When the preset or visually satisfactory expansion state is reached, the operator releases the pressing operation part 17, and the locking pin 16 automatically springs into the positioning groove 18 corresponding to the current position under the restoring force of the second elastic reset member 19, emitting a crisp "click" sound as feedback of being in place, instantly completing the position lock. This allows the operator to maintain the expanded state without continuously applying gripping force, effectively relieving hand fatigue caused by prolonged emergency operations, while also preventing the expansion angle from unexpectedly retracting due to hand tremors or weakened strength.

[0125] During the one-handed quick assembly and disassembly of the front support component 2, in the initial assembly process, the operator aligns the guide pin 23 of the front support component 2 with the axial section entrance of the quick-release guide groove 22 on the handle body 1 and pushes it in axially to the end. Then, the operator rotates the front support component 2 clockwise, causing the guide pin 23 to slide along the circumferential section to its end position. At this point, under the elastic force of the third elastic pre-tightening member 27, the locking ring 24 automatically pushes forward, causing the locking pin 25 to instantly spring into the locking groove 26 on the end face of the front support component 2, accompanied by clear tactile and audible feedback, completing the automatic locking. During disassembly, the operator only needs to pull the locking ring 24 backward with their fingers to overcome the elastic force of the third elastic pre-tightening member 27, causing the locking pin 25 to completely exit from the locking groove 26, releasing the axial lock. Then, the operator rotates the front support component 2 counterclockwise, causing the guide pin 23 to retract from the circumferential section back to the axial section. Finally, the operator pulls out the front support component 2 axially to complete the separation. The entire operation requires no tools and can be completed blindly by touch, even with gloves on or limited visibility. This not only significantly improves the efficiency of changing different sizes of the endpiece or post-operative cleaning and disinfection, but more importantly, it completely physically isolates the endpiece, which directly contacts the patient's bodily fluids and mucous membranes, from the main handle containing precision electronic components. This allows the endpiece to withstand high-temperature, high-pressure sterilization or chemical immersion disinfection, fundamentally cutting off the transmission route of cross-infection and significantly improving the safety of reusable devices and ease of maintenance.

[0126] In this embodiment: the video laryngoscope also includes a visualization component, which includes an image acquisition unit and an illumination unit;

[0127] The visualization component is installed at the distal end of the hollow rod 6 and configured to move synchronously to the distal end with the axial movement of the hollow rod 6 to avoid soft tissue obstruction.

[0128] The image acquisition unit includes a wide-angle camera 28, and the illumination unit includes a ring-shaped light-emitting element 29 arranged around the wide-angle camera 28;

[0129] The connecting line between the wide-angle camera 28 and the ring-shaped light-emitting element 29 is internally integrated into the hollow cavity of the hollow rod body 6. The ring-shaped light-emitting element 29 is preferably a ring-shaped soft-light LED lamp.

[0130] In traditional video laryngoscopy, the camera is usually fixed at a specific position at the front of the lens. When encountering patients with thick tongues or drooping epiglottis, even if the lens is in place, the rebounding soft tissue can easily adhere to the lens surface, causing a complete blackout, forcing the operator to repeatedly adjust the lens angle or perform blind probing. In this application, when the operator activates the drive assembly to deflect the first dilator 3 and the second dilator 4 in opposite directions to open the pharynx, the hollow rod 6 will inevitably move axially towards the distal end. At this time, the wide-angle camera 28 and the ring-shaped light-emitting element 29 installed at the distal end of the hollow rod 6 advance forward synchronously. On the one hand, the forward movement of the lens physically shortens its distance from the glottis target. At the moment the dilator opens the tissue gap, the lens can enter the gap more deeply, thereby obtaining a closer and clearer close-up view of the glottis. On the other hand, the lens and the conical sleeve itself constitute a blunt forward protrusion, which can actively push away any small amount of mucosal folds or secretions that may remain in front of the lens during the forward movement, thereby eliminating the time difference and spatial blind spot between the completion of the dilation action and the clearing of the field of vision, significantly improving the certainty and safety of the intubation operation.

[0131] To further enhance the biosafety and structural reliability of the device, the connecting wires of the wide-angle camera 28 and the ring-shaped light-emitting element 29 are embedded within the hollow cavity of the hollow rod 6. The hollow rod 6 not only serves as a drive shaft for transmitting expansion power but also acts as a protective channel for electrical circuitry. After exiting from the rear end of the conical sleeve, the connecting wires immediately pass through the internal cavity of the hollow rod 6 and extend axially to the proximal end of the handle body 1, where they electrically connect to the main control circuit board or display assembly.

[0132] Furthermore, the wide-angle camera 28 and the ring-shaped light-emitting element 29 are not independently suspended, but are integrated and mounted on a conical sleeve, which is fixedly connected to the distal end of the hollow rod 6 facing the depth of the pharynx. This rigid connection structure ensures that the visualization component can accurately follow the axial displacement of the hollow rod 6, forming a stable motion coupling relationship. While the wide-angle camera 28 and the ring-shaped light-emitting element 29 are preferred examples, in other embodiments, the image acquisition unit can be replaced with an infrared camera with night vision capabilities, a fluorescence imaging module, or an ultrasound probe, etc., and the illumination unit can also use a dot-matrix LED, a fiber optic beam, or other medical cold light sources, as long as they can move synchronously with the transmission mechanism and provide the necessary visual information, they should all be covered within the scope of protection of this application.

[0133] In this embodiment: the reverse deflection angle range of the first expansion member 3 and the second expansion member 4 is both 0° to 30°;

[0134] The hinge shaft 5 is a flexible damping hinge shaft. The first expansion member 3 and the second expansion member 4 are respectively hinged to the front support member 2 through the flexible damping hinge shaft. By setting the flexible damping hinge shaft, on the one hand, the damping torque can suppress the rapid swing of the expansion member during the driving process, so that the deflection motion presents a smooth and controllable gradual characteristic, avoiding impact damage to the tissue due to excessive instantaneous acceleration. On the other hand, the damping structure eliminates the rigid fulcrum effect at the hinge, so that the connection between the expansion member and the front support member 2 presents a soft elastic transition, further improving the biocompatibility and operational comfort of the overall structure.

[0135] The flexible damping hinge shaft is configured to provide damping torque, causing the deflection motion of the first expansion member 3 and the second expansion member 4 to be a progressive, flexible flip.

[0136] In this embodiment: the driving component includes two independent driving units, which are respectively connected to the first expansion member 3 and the second expansion member 4;

[0137] Each drive unit is configured to independently adjust the deflection angle of the corresponding first expansion member 3 or second expansion member 4 to achieve independent control of the vertical expansion amplitude.

[0138] Working principle:

[0139] First, the operator holds the handle body 1 and confirms that the first dilator 3 and the second dilator 4 are in the fully closed initial position. At this time, the first dilator 3 and the second dilator 4 fit tightly together, presenting a slender, streamlined profile; the flexible buffer layer and rounded blunt edges on the outer surfaces of both constitute a fully flexible contact interface. During insertion, this low-profile, edgeless shape allows the video laryngoscope to gently slide into the pharynx along the tongue surface, avoiding the impact of traditional metal lenses on teeth and the scraping of the posterior pharyngeal mucosa, significantly reducing the patient's stress response and the risk of tissue damage.

[0140] Once the tip of the video laryngoscope reaches the predetermined depth, the operator selects either electric or manual mode to activate the drive assembly based on the site conditions. The drive assembly, via a transmission mechanism, drives the first dilator 3 and the second dilator 4 to rotate synchronously in opposite directions around their respective hinge axes 5. In this specific case, the upper dilator 3 smoothly lifts the drooping epiglottis, while the lower dilator 4 simultaneously pushes down the thickened tongue base and pharyngeal lateral wall soft tissue. This bidirectional, opposite movement of the two dilators changes the traditional single-mode video laryngoscope that relies solely on upward force to overcome all resistance, allowing for a larger pharyngeal opening space with less local pressure. Simultaneously, the wide-angle camera 28 and the ring-shaped light-emitting element 29, mounted at the distal end of the transmission mechanism, move forward into the depths of the pharynx in sync with the dilation action. This allows the lens to actively pass through the opened tissue gaps, physically avoiding the tongue base or epiglottic folds that might rebound and obstruct the view, thus obtaining a clear, blind-spot-free glottic image the instant dilation is completed, completely eliminating the risk of blind probing due to obstructed vision in traditional operations.

[0141] Once a satisfactory field of vision is achieved, thanks to the self-locking characteristics of the transmission mechanism or the manual graded locking mechanism, the dilation state is stably maintained, eliminating the need for the operator to continuously apply external force, allowing them to focus both hands on the precise insertion of the endotracheal tube. Throughout the dilation and intubation process, the flexible buffer layer on the surface of the first dilator 3 and the second dilator 4 always acts as a medium in contact with human tissue, converting the mechanical spreading force into a uniformly distributed surface load. This effectively avoids mucosal ischemia, tearing, or postoperative edema caused by point compression, providing a high level of safety, especially for patients with abnormal coagulation function or elderly and fragile patients.

[0142] Finally, when intubation is complete, the operator controls the drive assembly to reverse or release the lock. The first dilator 3 and the second dilator 4 automatically and smoothly close under the action of the reset elastic element, returning to the initial streamlined state. They are then withdrawn non-invasively along the oropharyngeal curve, avoiding interference with the established airway or secondary traction on soft tissues during the withdrawal process.

[0143] After use, the operator can quickly pull the locking ring 24 with one hand to separate the front support 2 from the handle body 1. The front part, which comes into direct contact with the patient's bodily fluids, can be thoroughly sterilized by high-temperature and high-pressure sterilization or chemical immersion disinfection, while the handle body 1, which contains precision electronic components, is physically isolated and protected. This fundamentally cuts off the route of cross-infection and solves the clinical pain point of traditional integrated video laryngoscopes being difficult to disinfect thoroughly.

[0144] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0145] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A video laryngoscope, characterized in that, include: handle body(1); The front support (2) is connected to the far end of the handle body (1); The first expansion member (3) and the second expansion member (4) are respectively hinged to the front end support member (2) via a hinge shaft (5). The first expansion member (3) and the second expansion member (4) both include a support base that provides expansion stiffness and a flexible buffer layer covering the outer surface of the support base. A drive assembly is disposed on the handle body (1); and A transmission mechanism is connected between the drive assembly and the first expansion member (3) and the second expansion member (4); The transmission mechanism is configured to: in response to the drive of the drive component, convert the power output by the drive component into the reverse deflection motion of the first expansion member (3) and the second expansion member (4) about their respective hinge axes (5) to achieve bidirectional expansion of the target cavity.

2. The video laryngoscope according to claim 1, characterized in that, The supporting substrate is made of rigid material, and the flexible buffer layer is made of medical flexible material; The human contact edges of the first expansion member (3) and the second expansion member (4) are both rounded and blunted.

3. The video laryngoscope according to claim 1, characterized in that, The transmission mechanism includes: An axial sliding member is slidably disposed along the axial direction of the handle body (1); and A connecting rod assembly is connected between the axial sliding member and the first expansion member (3) and the second expansion member (4); The axial sliding member is configured to move axially under the drive of the drive assembly, and to push the first expansion member (3) and the second expansion member (4) to rotate synchronously in opposite directions around their respective hinge axes (5) through the linkage assembly.

4. The video laryngoscope according to claim 3, characterized in that, The axial sliding component includes a hollow rod (6), which is horizontally slidably installed inside the handle body (1); The linkage assembly includes two transmission push rods (7) symmetrically arranged in the front end support (2), and two connecting rods (8) corresponding to the two transmission push rods (7). Both the first expansion member (3) and the second expansion member (4) are provided with sliding grooves (9); One end of each of the transmission push rods (7) abuts against the hollow rod body (6), and the other end is hinged to the corresponding sliding groove (9) through the corresponding connecting rod (8); The transmission mechanism also includes a hinge rod (10) connected between the output end of the drive assembly and the end of the hollow rod (6); When the transmission push rod (7) moves axially, it drives the corresponding first expansion member (3) or second expansion member (4) to deflect through the sliding hinge engagement of the connecting rod (8) in the sliding fit groove (9); The transmission mechanism further includes a first reset elastic element (11) configured to provide a reset pull force for the axial sliding element and the transmission push rod (7).

5. The video laryngoscope according to claim 1, characterized in that, The driving component includes: An electric linear actuator (12) is fixed inside the handle body (1), and its output end is connected to the transmission mechanism; and Control button (13) is located on the surface of the handle body (1) and electrically connected to the electric linear actuator (12) for controlling the start, stop and extension stroke of the electric linear actuator (12).

6. The video laryngoscope according to claim 1, characterized in that, The driving component includes: The guide shaft (14) is fixed inside the handle body (1); A sliding connecting seat (15) is slidably mounted on the guide shaft (14) and connected to the transmission mechanism; The locking pin (16) is slidably installed in the sliding connecting seat (15); The pressing operation part (17) is fixed to the locking pin (16) and extends to the outside of the handle body (1); and Multiple positioning grooves (18) are equidistantly provided on the handle body (1) along the sliding trajectory of the pressing operation part (17). The locking pin (16) is configured to be selectively inserted into any of the positioning slots (18) to lock the axial position of the sliding connecting seat (15); The second elastic reset member (19) is connected between the locking pin (16) and the sliding connecting seat (15) and is configured to provide an elastic force to the locking pin (16) toward the positioning groove (18); The side wall of the handle body (1) is provided with a guide groove (20), and the pressing operation part (17) is slidably installed in the guide groove (20); A limiting block (21) is fixed to the surface of the locking pin (16) and configured to selectively abut against the inner wall of the handle body (1) to limit the extension stroke of the locking pin (16).

7. The video laryngoscope according to claim 1, characterized in that, The outer wall of the far end of the handle body (1) is provided with a quick-release guide groove (22), which includes an axial section and a circumferential section communicating with the axial section. The inner wall of the front support member (2) is provided with a guide pin (23), and the guide pin (23) is slidably installed in the quick-release guide groove (22); The video laryngoscope also includes a locking ring (24) and a locking pin (25). The locking ring (24) is slidably sleeved on the handle body (1), and the locking pin (25) is fixed to the locking ring (24). The end face of the front support member (2) is provided with a locking groove (26), and the locking pin (25) is inserted into the locking groove (26); The video laryngoscope also includes a third elastic pretensioner (27), and the third elastic pretensioner (27) is sleeved on the handle body (1) and its two ends are respectively connected to the locking ring (24) and the handle body (1). The third elastic preload (27) is configured to provide a preload force to the locking ring (24) toward the front support (2) so that the locking pin (25) remains inserted in the locking groove (26).

8. The video laryngoscope according to claim 4, characterized in that, The video laryngoscope also includes a visualization component, which includes an image acquisition unit and an illumination unit; The visualization component is installed at the distal end of the hollow rod (6) and configured to move synchronously to the distal end with the axial movement of the hollow rod (6) to avoid soft tissue obstruction; The image acquisition unit includes a wide-angle camera (28), and the illumination unit includes a ring-shaped light-emitting element (29) arranged around the wide-angle camera (28). The connecting line between the wide-angle camera (28) and the ring light-emitting element (29) is built into the hollow cavity of the hollow rod (6).

9. The video laryngoscope according to claim 1, characterized in that, The reverse deflection angle range of the first expansion member (3) and the second expansion member (4) is 0° to 30°; The hinge shaft (5) is a flexible damping hinge shaft, and the first expansion member (3) and the second expansion member (4) are respectively hinged to the front end support member (2) through the flexible damping hinge shaft. The flexible damping hinge shaft is configured to provide a damping torque so that the deflection motion of the first expansion member (3) and the second expansion member (4) is a progressive flexible flip.

10. The video laryngoscope according to claim 1, characterized in that, The drive assembly includes two independent drive units, which are respectively connected to the first expansion member (3) and the second expansion member (4). Each of the drive units is configured to independently adjust the deflection angle of the corresponding first expansion member (3) or second expansion member (4) to achieve independent control of the vertical expansion amplitude.

Images