Dental damage preventing laryngoscope blade

Abstract

The present application relates to laryngoscope intubation technical field, specifically, it relates to a kind of tooth damage prevention laryngoscope intubation vane.It includes laryngoscope vane and handle, nose ridge support assembly is arranged at the unslotted side end of laryngoscope vane, and it is detachably connected between nose ridge support assembly and laryngoscope vane, and nose ridge support assembly includes shell, support and support, support is L-shaped, long arm end is movably installed in shell, short arm end is connected support, support can be rotatably attached to nose ridge bone, avoid local compression, long arm end terminal has pivot, sliding groove and rotation groove are set in shell, support is slidably adjusted support extension length by pivot, rotation angle is adjusted, adapt to different patient oral cavity anatomical difference, and nose ridge support assembly further includes locking mechanism, to stabilize and fix support.The present application transfers stress fulcrum to nose ridge bone by nose ridge support assembly, avoids tooth as fulcrum, reduces the risk of tooth damage.

Description

Technical Field

[0001] This invention relates to the field of laryngoscope intubation technology, and more specifically, to a laryngoscope intubation blade that prevents tooth damage. Background Technology

[0002] In clinical anesthesia, emergency resuscitation, and intensive care, laryngoscopic intubation is a crucial procedure for establishing an artificial airway and ensuring patient ventilation. A traditional laryngoscope mainly consists of a handle and a blade. The standard operating procedure requires the operator to insert the blade along the right side of the patient's mouth, push the tongue to the left, and bring the blade's tip to the vallecula (the valley between the base of the tongue and the epiglottis). The operator then pulls upwards along the handle to pry open the epiglottis and expose the glottis for insertion of the endotracheal tube.

[0003] In theory, this lifting force should act as a lever through the blade, primarily targeting the soft tissues of the tongue base and vallecula region to achieve effective mechanical transmission. However, in clinical practice, due to individual differences in patient anatomy (such as a thick tongue, small mandible, high Adam's apple, limited mouth opening, etc.) or limitations in the surgeon's operating space and field of vision, the tip of the blade may not be able to accurately and stably reach and "anchor" at the ideal vallecula fulcrum. When the soft tissue fulcrum fails or the force is insufficient, the surgeon may unconsciously increase the lifting force to overcome the resistance of the tongue and pharyngeal tissues and to expose the glottis as much as possible.

[0004] At this time, as Figure 4 As shown, the laryngoscope blade, being a rigid structure, can easily come into contact with and compress the patient's maxillary teeth in its middle or distal section. This transforms what should be a "soft tissue lever" operation into a "hard prying" action with the teeth as an unexpected fulcrum. This unintended "tooth fulcrum" effect is the root cause of tooth damage. Especially for patients with loose teeth, cavities, crown restorations, or periodontal disease, this prying action can easily lead to tooth fracture, loosening, or even loss. Summary of the Invention

[0005] The purpose of this invention is to provide a laryngoscope tube blade that prevents tooth damage, in order to solve the problem that existing laryngoscopes may accidentally use teeth as a fulcrum during operation due to the failure of soft tissue fulcrum, thereby causing tooth damage.

[0006] To achieve the above objectives, a laryngoscope blade for preventing tooth injury is provided, comprising a laryngoscope blade and a handle. A nasal ridge support assembly is provided at the grooveless end of the laryngoscope blade. The nasal ridge support assembly includes a housing, a support frame, and a spur, wherein:

[0007] The support has an L-shaped structure, with its long arm movably disposed inside the outer shell, and its short arm parallel to the end plane of the laryngoscope blade and extending forward.

[0008] The support is rotatably connected to the end of the short arm and is used to support the patient's nasal ridge.

[0009] In the above technical solution, a separate nasal ridge support assembly is arranged on the non-slotted side of the laryngoscope blade end connected to the handle, changing the mechanical transmission path in the traditional laryngoscope operation. The assembly takes a movable L-shaped support as the core, with the long arm end built-in the shell to ensure stable connection and force transmission with the laryngoscope body, and the short arm end extending forward parallel to the blade end plane can accurately guide the support to the nasal ridge bone area of the oral vestibule. When the operator pulls the handle for intubation operation, the force that may act on the teeth due to the failure of the soft tissue fulcrum is effectively transferred to the new and more stable bone support point composed of the support and the nasal ridge bone.

[0010] On this basis, a rotating shaft is rotatably connected to the end of the long arm;

[0011] A sliding groove is formed in the shell, and the support is slidably connected with the sliding groove through the rotating shaft, and the support moves along the sliding groove to adjust the extension length of the support;

[0012] A rotating groove is also formed in the shell, and the support rotates in the rotating groove through the rotating shaft to adjust the angle of the support.

[0013] In this technical solution, the length and angle of the support are adjusted through the rotating shaft, the sliding groove and the rotating groove. The rotating shaft slides along the sliding groove to adjust the extension length of the support to adapt to different depths of the oral cavity of different patients and ensure effective support. The rotating shaft rotates in the rotating groove to adjust the angle of the support so that the support can be aligned with and fit the nasal ridge bone of different radii. Through the adjustment of the two degrees of freedom of sliding and rotating, the support can accurately adapt to individual differences and establish a stable and reliable support with the nasal ridge bone.

[0014] In another technical solution, the nasal ridge support assembly further comprises a locking mechanism for locking the position of the support, and the locking mechanism comprises an adjusting bolt and a top block, wherein:

[0015] The adjusting bolt penetrates the top of the shell and abuts against the upper surface of the support, the top block is arranged below the support, and a spring is arranged between the bottom of the top block and the shell;

[0016] An elastic buffer layer is covered on the support surface of the support.

[0017] In the technical solution, the locking mechanism cooperates with the spring top block through the adjusting bolt to rigidly clamp the support from the top and bottom directions. When the adjusting bolt is screwed in, the end thereof presses the upper surface of the support downward, and pushes the support downward to tightly contact the top block below. The spring at the bottom of the top block provides a continuous upward pre-tightening reaction force, so that the support is firmly locked, and displacement of the support during operation is effectively prevented. In addition, the elastic buffer layer covering the support surface can fill the small gap between the support and the nasal ridge bone surface through deformation, increase the contact area and make the pressure distribution more uniform, thereby improving the stability of the support. In addition, the soft texture of the elastic buffer layer also avoids potential compression damage of the nasal ridge bone mucosa by the hard material, thereby further enhancing the safety of the operation.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. In the tooth-damage-preventing laryngoscope intubation blade, the force system is reconstructed by the nasal ridge support assembly, and the support surface is covered with an elastic buffer layer. The elastic buffer layer can adapt to the physiological curvature of the nasal ridge bone surface and fill the small gap between the support and the nasal ridge bone. The lifting force is uniformly transmitted to the nasal ridge bone through a larger contact area, and stable nasal ridge bone surface support is formed. The tooth-damage-preventing laryngoscope intubation blade completely avoids tooth contact and fundamentally eliminates the damage risk caused by tooth point support. At the same time, the tooth-damage-preventing laryngoscope intubation blade avoids the compression damage of the nasal ridge bone mucosa caused by local pressure concentration, and maximally protects the oral health of the patient.

[0020] 2. In the tooth-damage-preventing laryngoscope intubation blade, the nasal ridge support assembly has multi-dimensional adjustment capability, which can cope with the anatomical differences of different patients and ensure the accurate adaptation of the nasal ridge bone surface support. The support slides along the sliding groove through the rotating shaft, and the extension length of the support can be flexibly adjusted to adapt to the differences in the anteroposterior diameter of the oral cavity of adult and child patients, different jaw bone development types (long face type, short face type, and even face type), and the shortening of the distance between the upper and lower jaws of elderly patients due to jaw bone atrophy. The support rotates in the rotating groove through the rotating shaft, and the nasal ridge bone and the oral midline angle and the nasal ridge bone surface curvature difference of different patients can be adapted by the rotatable design of the support itself. The tooth-damage-preventing laryngoscope intubation blade avoids unstable support caused by angle deviation, and ensures stable force transmission during intubation operation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 The figure is a schematic diagram of the back structure of the present application;

[0023] Figure 3 The figure is a schematic diagram of the internal structure of the nasal ridge support assembly of the present application;

[0024] Figure 4An operation schematic diagram in the prior art with teeth as an accidental fulcrum;

[0025] Figure 5 A stress analysis schematic diagram of the invented support;

[0026] Figure 6 A stress analysis schematic diagram of the invented top block;

[0027] Figure 7 A stress analysis schematic diagram of the invented support;

[0028] Figure 8 A use state schematic diagram of the invention;

[0029] Figure 9 A use state schematic diagram of the invention.

[0030] The meanings of the various reference numbers in the drawings are as follows:

[0031] 1, laryngoscope blade; 2, handle; 3, nasal ridge support assembly; 31, support; 32, support; 33, rotating shaft; 34, rotating groove; 35, sliding groove; 36, spring; 37, top block; 38, adjusting bolt; 39, outer shell. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0033] Please refer to Figures 1-2 The present embodiment aims to provide a laryngoscope intubation blade that prevents tooth damage, which is improved based on the structure of the existing laryngoscope blade 1 and handle 2. A nasal ridge support assembly 3 is arranged on the non-groove side (non-functional operation surface for lifting the epiglottis) of the laryngoscope blade 1. Through the transfer of the fulcrum and the optimized distribution of force, the problem of tooth damage caused by the contact between the blade and the teeth in the traditional laryngoscope intubation is solved, while ensuring that the original glottis exposure function and operation habit are not affected.

[0034] The laryngoscope blade 1 uses the existing curved structure design, which is consistent with the anatomical and physiological characteristics of the human pharynx, that is, the natural curved curve of the adult tongue root and the epiglottic valley region. The curved radius of the blade is verified by clinical anatomical data to ensure smooth sliding along the surface of the tongue during insertion, avoiding excessive compression or traction on the oral soft tissue. The blade body is made of medical-grade stainless steel, which has sufficient structural strength and good biocompatibility. It can withstand the required lifting force during intubation without deformation, ensuring the stability of the glottis exposure, and avoiding adverse reactions with the oral mucosa. The handle 2 is a mature structure, which adopts an ergonomic holding form. Its length and surface slip-resistant design are suitable for most operator hand sizes, which can ensure stable force application during operation and reduce the learning cost of operation.

[0035] The nasal ridge support assembly 3 is the main core improvement, which is designed as a detachable structure. It is located at the end of the laryngoscope blade 1 without a groove on one side, below the connection position of the handle 2, avoiding interference with the core operation function of the existing laryngoscope. In the existing laryngoscope intubation operation, the core action of the operator is to reach the epiglottic valley with the front end of the blade, guide the tracheal tube with the grooved side, and judge the force feeling of the lifting. The installation position is far away from the epiglottic contact area of the front end of the blade. The blade needs to be deep into the oral cavity to the epiglottic valley, which is far away from the end of the blade. The nasal ridge support assembly 3 installed at the end can avoid scratching with the tongue root and soft tissue of the throat during the insertion of the blade, and also will not cause the positioning accuracy of the front end of the blade to decrease. At the same time, the non-grooved side is not the guiding path of the tracheal tube. In the traditional operation, the tracheal tube needs to slide along the groove of the grooved side of the blade to insert into the glottis. The nasal ridge support assembly 3 located on the non-grooved side will not block the insertion channel of the tracheal tube, nor will it interfere with the outer wall of the tracheal tube. Even if the nasal ridge support assembly 3 is added, the insertion speed and accuracy of the tracheal tube will not be significantly different from the traditional laryngoscope. In addition, from the operator's operation field of view, this position is in the non-visual field area of the operator observing the glottis. When the operator observes through the laryngoscope optical system or directly, the line of sight focuses on the front end of the blade and the glottis area. The nasal ridge support assembly 3 at the end will not enter the field of view, avoiding the problem of unclear glottis exposure caused by visual field obstruction.

[0036] In order to install the nasal ridge support assembly 3 on the non-groove side of the laryngoscope blade 1 end without weakening the blade strength, a design combining local thickening and embedded cavity is adopted. The non-groove side area of the laryngoscope blade 1 end is optimally thickened, and the thickened part is only concentrated in the installation area of the nasal ridge support assembly 3. The thickness of the rest of the laryngoscope blade 1 remains unchanged, ensuring that the overall insertion flexibility is not affected. An embedded installation cavity is opened in the thickened area, and the cavity depth only removes the material of the thickened part, retaining the original base thickness of the laryngoscope blade 1, avoiding weakening the main structure strength of the laryngoscope blade 1, and when the intubation pulling force is applied, the peripheral area of the installation cavity will not appear local deformation or cracking. The specific installation method of the laryngoscope blade 1 and the nasal ridge support assembly 3 can be small bolt fixation or sliding groove fixation clamping. This is a mature detachable connection structure, and will not be described here.

[0037] As shown in Figure 3 The nasal ridge support assembly 3 includes a shell 39, which is designed to match the shape of the laryngoscope blade 1 end. It is made of medical-grade titanium alloy, which not only has lightweight characteristics to avoid adding weight to the laryngoscope blade 1 end, but also has sufficient structural strength to protect the internal components from external impact. A rotating groove 34 is opened in the shell 39, with the groove opening facing the laryngoscope blade 1 end. A bracket 31 is arranged in the rotating groove 34. The bracket 31 is similar to an L shape, and the head of its extended end is provided with a support 32. The bracket 31 is connected with the rotating groove 34 through a rotating shaft 33, and the bracket 31 rotates in the rotating groove 34 through the rotating shaft 33 to adjust the angle, thereby adapting to the angle difference between the nasal ridge bone and the oral midline of different patients, avoiding instability or mucosa compression due to angle deviation. A sliding groove 35 is also opened in the shell 39, located on the transverse sides of the rotating groove 34, with the center axis of the rotating groove 34 as the symmetry axis. The grooves of the two sliding grooves 35 are opposite to each other, and the curvature of the sliding groove 35 is completely consistent with the curvature of the laryngoscope blade 1 body. The center of the groove body is coaxially distributed with the center of the shell 39 and the center of the laryngoscope blade 1 end, ensuring that the sliding groove 35 is always in the middle position of the assembly. The rotating shaft 33 is slidingly connected with the sliding groove 35, so that the bracket 31 can slide along the sliding groove 35, thereby adjusting the spatial position of the support 32.

[0038] From the perspective of the distance adaptation between the nasal ridge bone and the end of the laryngoscope blade 1, there are significant physiological differences in the oral anteroposterior diameter (distance from the incisors to the posterior pharyngeal wall) and the vertical spacing of the upper and lower jaws among different patients. The oral anteroposterior diameter of adults and children can differ by 30%-50%, and even among adults, the oral anteroposterior diameter can fluctuate by 10%-15% due to the type of jawbone development (long face, short face, and even face). The spacing between the upper and lower jaws also differs due to the state of tooth eruption and tooth loss, such as in elderly patients with jawbone atrophy due to tooth loss, the spacing between the upper and lower jaws can be shortened by 15%-20% compared to young adults. If the support 32 has a fixed structure, for patients with a longer oral anteroposterior diameter, the effective action distance of the support 32 is insufficient, and it cannot reach the core load-bearing area of the nasal ridge bone, resulting in the failure of the support fulcrum and the interruption of the lifting force transmission. For patients with a nasal ridge bone located inward and a narrow oral entrance space, the fixed length of the support 32 is too short to fit the nasal ridge bone and is easily offset to the inside of the oral entrance, causing extrusion with the inside of the lips and the front edge of the palate (tissue at the oral entrance), leading to mucosal congestion or injury during the positioning of the laryngoscope blade 1. By sliding the pivot 33 along the sliding groove 35 towards the proximal end of the laryngoscope blade 1 (towards the outside of the handle 2, away from the inside of the oral cavity), the support 31 can be moved outward simultaneously, extending the length of the support 32 extending towards the nasal ridge bone, ensuring that the support 32 can accurately reach the nasal ridge bone position; by sliding the pivot 33 along the sliding groove 35 towards the distal end of the laryngoscope blade 1 (away from the handle 2, towards the inside of the blade body), the support 31 can be retracted inward into the housing 39, shortening the length of the support 32, avoiding the interference caused by the support 32 extending too long beyond the nasal ridge bone area and offsetting to the outside of the oral entrance, and at the same time adapting to the needs of patients with a nasal ridge bone located inward, achieving personalized adaptation for patients with different anatomical characteristics.

[0039] In the cooperation structure of the pivot 33 and the sliding groove 35, a damping mechanism is also provided to ensure that the support 31 remains stable after being adjusted in place, avoiding position deviation caused by external disturbances or operating reaction forces. A ring-shaped damping groove is opened along the trajectory on the inner wall of the sliding groove 35, with a groove spacing that matches the adjustment stroke of the support 31, and elastic damping blocks are embedded at both ends of the pivot 33, protruding from the surface of the pivot 33. When the pivot 33 slides along the sliding groove 35, the damping blocks generate a moderate friction force with the groove wall, which neither hinders normal adjustment operations nor allows the support 31 to be displaced when it reaches the target position by the damping blocks being stuck in the ring-shaped groove, offsetting the displacement tendency caused by the intubation lifting force or slight pressure from the oral tissue.

[0040] When the support 31 is adjusted, in order to stabilize the support 31, an adjusting bolt 38 and a top block 37 are arranged above and below it respectively, forming a fixed clamping structure, and a medical silica gel layer is added below the adjusting bolt 38 and above the top block 37. The adjusting bolt 38 penetrates the upper part of the shell 39, and the depth of the adjusting bolt 38 in the rotating groove 34 is adjusted by threads, so that the medical silica gel layer at the end of the adjusting bolt 38 is tightly attached to the upper surface of the support 31, and downward pressure is applied. The bottom top block 37 cooperates with the vertical sliding groove on the inner wall of the shell 39, so that it can only move in the vertical direction, and a spring 36 is arranged between the bottom of the top block 37 and the shell 39. The spring 36 is always in a pre-compressed state, providing upward pre-pressure for the top block 37, so that the medical silica gel layer on the upper surface of the top block 37 tightly abuts against the lower surface of the support 31. When intubation in the clinic, when the operator pulls the laryngoscope handle 2 upward, the pulling force is transmitted to the nasal ridge support assembly 3 through the laryngoscope blade 1, and the support 31 as the force transfer core will produce an upward movement trend and a slight torsion force. At this time, the adjusting bolt 38 will stably apply downward pressure to the upper surface of the support 31 through the thread self-locking feature, and the bottom spring 36 of the top block 37 will continuously provide upward pre-pressure, forming a rigid clamping frame for the support 31 from both directions, directly offsetting the upward movement trend of the support 31, and avoiding the deviation of the glottis exposure caused by the displacement of the support fulcrum under stress.

[0041] A medical silica gel layer is added below the adjusting bolt 38 and above the top block 37. First, the silica gel layer has excellent elastic deformation capability, which can fill the gap between the end of the adjusting bolt 38, the working surface of the top block 37, and the surface of the bracket 31, convert the possible point or line contact into complete surface contact, make the clamping force evenly distributed on the upper and lower surfaces of the bracket 31, avoid local stress concentration leading to deformation or surface damage of the bracket 31, and at the same time ensure that the pressure of the adjusting bolt 38 and the supporting force of the top block 37 can be transmitted to the bracket 31 synchronously, preventing the bracket 31 from tilting due to uneven stress. Second, the friction coefficient of medical silica gel with the metal surface of the bracket 31 is higher than that of rigid contact between metals, which can directly limit the slight torsion and lateral sliding of the bracket 31 through friction, forming a double fixation with the damping mechanism at the shaft 33. The damping of the shaft 33 mainly limits the displacement of the bracket 31 along the sliding groove 35, and the friction of the silica gel layer mainly restricts the unintended torsion of the bracket 31, while ensuring that the bracket 31 always maintains a stable posture under the action of the lifting force, avoiding the displacement of the contact position of the support 32 and the nasal ridge bone. Finally, the elastic buffer of the silica gel layer can weaken the influence of slight body movement of the patient's oral cavity on the stability of the bracket 31, and reduce the risk of fulcrum displacement caused by sudden external force. Moreover, the buffering characteristics of the silica gel layer can also improve the safety and convenience of clinical operation. During the tightening process of the adjusting bolt 38, the elastic feedback of the silica gel layer can allow the surgeon to accurately perceive the clamping force through the sense of touch. When the silica gel layer deforms moderately, the surgeon can intuitively judge that the bracket 31 has been stably fixed, without the need to over-tighten the bolt to cause component damage. At the same time, the buffering effect can avoid the instantaneous impact on the bracket 31 when the bolt is tightened too quickly. After the cannula is completed, counterclockwise rotation of the adjusting bolt 38 can release the clamping pressure with the help of the elastic restoring force of the silica gel layer, allowing the bracket 31 to smoothly escape from the fixed state, avoiding the adjustment jam caused by rigid adhesion between metals.

[0042] The bracket 31 is designed as L-shaped, with an angle of 82° (based on the angle between the longitudinal section and the transverse section of the bracket 31) at the folding corner, so that the head of the extension end of the support 32 is parallel to the end of the laryngoscope blade 1. The area of the laryngoscope blade 1 mounting the nasal ridge support assembly 3 is a flat structure, and the flat surface is adapted to the curved trajectory of the main body of the laryngoscope blade 1. During clinical intubation, the laryngoscope blade 1 needs to smoothly extend along the surface of the tongue to the oral cavity, and the area of the mounting assembly needs to correspond to the horizontal height and inclination trend of the nasal ridge bone in the oral cavity. As a component directly contacting the nasal ridge bone, the support 32 can only be parallel to the mounting area to ensure that the working surface of the support 32 always fits the physiological curvature of the surface of the nasal ridge bone, and the support 32 only extends towards the nasal ridge bone and does not tilt towards the inside of the oral cavity. The 82° folding angle achieves parallel adaptation through angle compensation. The longitudinal section of the bracket 31 needs to extend along the flat surface of the area of the laryngoscope blade 1 mounting assembly, and the transverse section needs to extend horizontally towards the nasal ridge bone. The 82° folding angle can offset the slight inclination caused by the curved main body of the laryngoscope blade 1, so that the working surface of the support 32 at the end of the transverse section is completely aligned with the flat surface at the end of the laryngoscope blade 1, and can cover most of the relative position differences between the nasal ridge bone and the blade mounting area of the population. At the same time, the acute angle design can make the transverse section of the bracket 31 compactly fit the limited space below the nasal ridge bone (the edge area of the oral cavity entrance), reduce the occupation of the transverse space of the oral cavity entrance, and avoid the inclination of the support 32 towards the inside of the oral cavity entrance (and further contact the lips or the front end of the palate), or the deviation of the support 32 towards the outside of the lips (and cannot contact the nasal ridge bone). Especially for patients with small mandibles and narrow oral cavity entrance space, the contact risk of the support 32 with the tissues at the oral cavity entrance can be further reduced, and the support 32 can always move in the target area at the edge of the oral cavity entrance, parallel to the mounting assembly area of the laryngoscope blade 1, to ensure the stable force of the support 32.

[0043] The end of the transverse section of the support 31 (towards the protruding end of the nasal ridge bone) is provided with a mounting seat, the center of which is provided with a positioning shaft, the middle of which has an arc-shaped boss as a limiting block, and the arc of the limiting block is adapted to the rotation requirement of the support 32. The connecting part of the support 32 is provided with an elastic arc-shaped clamping jaw, and the center of the connecting part is provided with a shaft hole matched with the positioning shaft. The inner wall of the shaft hole is provided with an arc-shaped groove matched with the position of the limiting block of the positioning shaft, so that when the positioning shaft is inserted, the limiting block can be embedded in the arc-shaped groove, and the support 32 can be slightly rotated around the positioning shaft. The working surface of the support 32 in contact with the human nasal ridge bone is covered with a layer of medical silica gel, which has good elasticity and biocompatibility, can fill the small gap between the support 32 and the surface of the nasal ridge bone through deformation, and improve the fit. There are physiological differences in the surface of the nasal ridge bone of different patients, such as left and right inclination and different arc, and the support 32 with a fixed angle is easy to cause mucosa compression by local contact, but by manually adjusting the angle of the support 32, and cooperating with the elastic fit of the medical silica gel layer, the working surface of the support 32 can be completely fitted with the physiological arc of the nasal ridge bone, the support pressure is uniformly dispersed, the support stability during intubation is guaranteed, and the effective force transmission is ensured.

[0044] As shown in Figure 8 and Figure 9 , the mechanical transmission path and the lever balance principle in intubation operation are disclosed. In the mechanical model, the laryngoscope can be simplified as a first type of lever with the nasal ridge support point as the fulcrum. The total lifting force F t applied by the operator to the handle 2 is transmitted through the lever arm (laryngoscope blade 1), and finally converted into the effective component force F e for lifting the epiglottis at the front end of the laryngoscope blade 1. The counterforce F n exerted by the nasal ridge bone on the lever system through the support is the key to stable balance. According to the lever principle, the system satisfies the moment balance equation F t ×L1=F e ×L2 (L1 is the force arm of the fulcrum to F t , and L2 is the force arm of the fulcrum to F e ). This design ingeniously transfers the harmful counterforce accidentally borne by the upper teeth in the traditional operation to the nasal ridge bone which has a more solid structure, thereby eliminating the risk of tooth damage at the mechanical level.

[0045] In order to verify the mechanical properties of the related components, stress tests are carried out:

[0046] Support 32 bearing capacity test: as Figure 5As shown, a vertical force of 50N was applied to the prop 32 and its non-slip pad (304 stainless steel and silicone rubber, respectively) to simulate the maximum load on the nasal ridge bone during clinical operation. The test results showed that the prop 32 did not deform plastically or structurally, and its load-bearing capacity met the safety requirements of YY 0499-2023 and ISO 7376:2020 standards for laryngoscope-related components, proving that it can safely withstand operating forces in actual applications.

[0047] Locking mechanism clamping force test: as shown in Figure 6 The contact surface of the locking mechanism adjusting screw 38 and the top block 37 was subjected to force analysis. The maximum force threshold was set to 100N, which took into account the clinical lifting force (usually ≤150N) and a safety factor of 2-3. The results showed that within this threshold, the locking mechanism could achieve stable fixation of the bracket 31 without slipping, plastic deformation or clamping force decay, ensuring the reliability and durability of the assembly during long-term use.

[0048] Bracket 31 strength test: as shown in Figure 7 The L-shaped bracket 31 was subjected to a combination of lifting and twisting stresses simulating clinical operation. The stress distribution cloud map showed that under a load of 100N, the stress concentration area was located at the connection between the shaft 33 and the bracket 31 body, but the peak stress was much lower than the yield limit of 304 stainless steel, and the bracket 31 as a whole remained in an elastic deformation state, with a complete structure, meeting the strength requirements for repeated use.

[0049] In summary, the overall use method and working principle of the present application are as follows:

[0050] Method of use: Before operation, first adjust the nasal ridge support assembly 3 according to the patient's facial features. Slide and rotate the bracket 31 to preliminarily adapt the extension length and angle of the prop 32 to the patient's oral structure, then tighten the adjusting screw 38 to lock the bracket 31. Place the laryngoscope blade 1 into the patient's oral cavity, with the front end reaching the vallecula, and at the same time, make the prop 32 stably adhere to the surface of the nasal ridge bone. At this time, pull up the handle 2, the lifting force is transmitted to the nasal ridge support assembly 3 through the laryngoscope blade 1, and the force is evenly dispersed to the nasal ridge bone area by the prop 32, forming a stable bony support, thereby revealing the glottis to complete intubation. After the operation is completed, loosen the adjusting screw 38 in the opposite direction to release the locking of the bracket 31.

[0051] Working principle: The mechanical transmission path of laryngoscope intubation operation is reconstructed by the nasal ridge support assembly 3. When the operator applies the lifting force, the force is transmitted to the nasal ridge support assembly 3 through the laryngoscope blade 1, and finally transmitted to the nasal ridge bone which is a stronger load-bearing anatomical structure through the support 32. The bracket 31 as the key force transmission component converts the vertical lifting force into the action direction suitable for the load-bearing direction of the nasal ridge bone, and this force conversion ensures the efficiency and stability of mechanical transmission. The bracket 31 can adjust the extension length of the support 32 according to the oral structure of different patients through the sliding of the rotating shaft 33 in the sliding groove 35; at the same time, the support 32 can accurately fit the physiological curvature of the nasal ridge bone of different patients through the rotation of the rotating shaft 33 in the rotating groove 34, realizing personalized precise fitting. The locking mechanism can firmly fix the position of the bracket 31 after adjustment, wherein the adjusting bolt 38 and the top block 37, together with the pre-tightening force provided by the spring 36, ensure the stability of mechanical transmission and prevent displacement or loosening during operation. The elastic buffer layer on the surface of the support 32 will deform when stressed, which not only increases the contact area with the nasal ridge bone and makes the pressure distribution more uniform, but also avoids local compression damage to the nasal ridge bone mucosa that may be caused by hard materials. The present application realizes the fundamental change of the stress support point from teeth to nasal ridge bone without changing the traditional intubation operation habits, and changes the point contact stress originally concentrated on the teeth into a surface load distributed on the nasal ridge bone, thereby actively preventing tooth damage from occurring at the mechanical level.

[0052] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A laryngoscope blade for intubation comprising a laryngoscope blade (1) and a handle (2), characterized in that: The non-slotted side end of the laryngoscope blade (1) is provided with a nasal ridge support assembly (3), which comprises a shell (39), a bracket (31) and a support (32), wherein: The bracket (31) is in L-shaped structure, the long arm end of which is movably arranged in the shell (39), and the short arm end extends forward parallel to the end plane of the laryngoscope blade (1), the bracket (31) is used for receiving the pulling force from the laryngoscope blade (1) and transmitting it to the support (32); The support (32) is rotatably connected to the end of the short arm end, and the support (32) is used for taking the nasal ridge bone as a fulcrum to convert the pulling force into a supporting force; The long arm end is rotatably connected with a rotating shaft (33); The shell (39) is provided with a sliding groove (35), and the bracket (31) is slidably connected with the sliding groove (35) through the rotating shaft (33), the bracket (31) moves along the sliding groove (35) to adjust the extension length of the support (32); The shell (39) is also provided with a rotating groove (34), and the bracket (31) rotates up and down in the rotating groove (34) through the rotating shaft (33) to adjust the angle of the bracket (31); The nasal ridge support assembly (3) further comprises a locking mechanism for locking the position of the bracket (31), and the locking mechanism comprises an adjusting bolt (38) and a top block (37), wherein: The adjusting bolt (38) penetrates the top of the shell (39) and abuts against the upper surface of the bracket (31), the top block (37) is arranged below the bracket (31), and a spring (36) is arranged between the bottom of the top block (37) and the shell (39).

2. The laryngoscope blade of claim 1, wherein: The long arm end and the short arm end are fixedly connected, and the included angle between the long arm end and the short arm end is 75°-85°.

3. The laryngoscope blade of claim 1, wherein: The sliding groove (35) is provided with a damping structure for providing damping force when the bracket (31) slides and keeping it at the target position.

4. The laryngoscope blade of claim 1, wherein: The end of the adjusting bolt (38) and the top of the top block (37) are provided with an elastic material layer.

5. The laryngoscope blade of claim 1, wherein: The support surface of the support (32) is covered with an elastic buffer layer.

6. The laryngoscope blade of claim 1, wherein: The nasal ridge support assembly (3) and the laryngoscope blade (1) are detachably connected.

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