38 results about "Airway wall" patented technology

Methods of treating a central airway obstruction (CAO), benign airway stenosis, asthma, chronic obstructive pulmonary disease (COPD), or an airway tumor in a human subject, methods of treating chronic rhinosinusitis (CRS) or chronic rhinosinusitis with nasal polyps (CRSwNP) in a human subject, methods of treating a eustachian tube disorder in a human subject, and devices and systems for performing the methods. A method of treating a central airway obstruction (CAO), benign airway stenosis, asthma, chronic obstructive pulmonary disease (COPD), or an airway tumor in a human subject includes inserting a drug-coated balloon catheter into a target site in a trachea, mainstem bronchus, bronchus intermedius, lobar bronchus, segmental bronchus, or sub-segmental bronchus, wherein the balloon is coated with a coating layer including the therapeutic agent and one or more additives. The therapeutic agent includes paclitaxel, sirolimus, or a derivative thereof. The method includes inflating the balloon to dilate the airway and deliver a therapeutic agent to the airway wall. The method includes deflating the balloon. The method also includes withdrawing the balloon catheter from the target site.

An atomization assembly includes a housing assembly and a heating element. The housing assembly is formed with an e-liquid tank and an atomization tank spaced apart from each other. The housing assembly is further formed with an air inlet channel and a vent channel. The air inlet channel is in communication with the atomization tank. The vent channel is in communication with the e-liquid tank. The atomization tank is isolated from the vent channel. The housing assembly includes an air channel wall forming the vent channel. The air channel wall is at least partially located in the atomization tank.

The application discloses a spoiler assembly for a vehicle and the vehicle, the spoiler assembly comprises a base body, a first air guide and a second air guide, the base body is suitable for being connected with the back of the vehicle body, the base body extends in the width direction, the upper surface of the base body is formed with an air guide surface, the first air guide and the second air guide are symmetrically arranged at the two ends of the base body, at least part of the first air guide and at least part of the second air guide protrude from the air guide surface, the first air guide and the second air guide are arranged in the vehicle width direction, wherein the two side edges of the first air guide and the second air guide towards each other are respectively formed with a first air channel wall and a second air channel wall, the first air channel wall and the second air channel wall are arranged away from each other in the direction close to the air guide surface, a first concave air channel is formed between the first air channel wall and the air guide surface, and a second concave air channel is formed between the second air channel wall and the air guide surface, so that the wind resistance of the vehicle can be further reduced.

Systems and methods involve abrading a patient lung airway wall to reduce mucus production therein. Exemplary techniques include rotationally and / or linearly oscillating an abrasive material against the airway wall so as to damage mucus producing tissues, for example by removing goblet cells, while destroying less than the entire airway wall. The abrasive material may be present on the surface of an expandable balloon body or another expandable device, which can be delivered to the patient treatment site via a bronchoscope. In some cases, the abrasion techniques can cause cell damage or death at a controlled or predetermined tissue depth.

The invention relates to the technical field of medical instruments, in particular to an airway stent for airway stenosis treatment, which comprises an end stent, the end stent is composed of an outer tube body, a conical body and an inner tube body which are coaxially distributed, the outer side ring surface of the outer tube body is fixedly connected with the inner wall of a narrowed port of the conical body, and the inner tube body is arranged on the inner side ring surface of the outer tube body. By means of the optimized design of the connecting mechanism, the end support and the valve support are effectively connected, self-adaptive contraction of the valve support can be achieved, the valve support can be matched with the inner membrane mechanism, the dynamic change of an air channel is coped, the self shape and the supporting force are effectively adjusted, the valve support is tightly attached to the wall of the air channel all the time, stable supporting is provided, and the service life of the valve support is prolonged. Support displacement or insufficient support caused by diameter change of the airway is prevented; and through mutual combination of the limiting assembly and the rotary flow distribution assembly, the limiting function during dynamic adjustment is achieved, a flushing agent can be conveniently injected into the support, and granulation is prevented from growing through meshes of the support.

The present invention relates to the field of medical instruments, and in particular to a subglottic drainage and flushing device suitable for outdoor environments, comprising an endotracheal tube, a balloon pressure measuring assembly being installed on the surface of the endotracheal tube, a balloon being provided on the surface of the endotracheal tube, a drainage tube being fixedly connected to the surface of the endotracheal tube, one end of the drainage tube being movably connected to a medical three-way tube, one end of the medical three-way tube being movably connected to a third connecting tube, a negative pressure suction assembly being movably installed on the other end of the medical three-way tube, a heating assembly being detachably connected to the surface of the third connecting tube, and one end of the third connecting tube being movably connected to a physiological saline bag. The flushing device can be controlled by a motor so that the pressure of the physiological saline is controllable during flushing, thereby preventing excessive pressure from forming a gap between the balloon and the airway wall or even causing damage to the balloon, leading to lung infection in the patient, and thereby facilitating the subglottic flushing operation of medical personnel.

An access tool for piercing an airway wall including a dilating member (308) having a minimally traumatic tip formed on a distal end, a piercing member (302) having a piercing tip on a distal and a handle (304) formed on a proximal end, and a spring-loaded actuator (406) connecting the piercing member and the dilating member such that upon actuation the piercing member is urged in the direction of the dilating member.

The invention discloses a catheter system for treating chronic obstructive pulmonary disease through two-stage pulsed electric field ablation, and the system comprises a two-stage electrode assembly which is used for guaranteeing that current only flows between specific electrodes; the handle regulation and control mechanism is used for dynamically adjusting the size of the electrode so as to adapt to different airway diameters; imaging probes, integrated OCT and / or ultrasound, for providing real-time airway wall structure and tissue condition monitoring. By means of the technical scheme, the problems that in the prior art, current flows through deep tissue in the ablation process of a single-stage system, and risks are caused due to incomplete electrode coverage can be effectively solved.

Systems and methods involve abrading a patient lung airway wall to reduce mucus production therein. Exemplary techniques include rotationally and / or linearly oscillating an abrasive material against the airway wall so as to damage mucus producing tissues, for example by removing goblet cells, while destroying less than the entire airway wall. The abrasive material may be present on the surface of an expandable balloon body or another expandable device, which can be delivered to the patient treatment site via a bronchoscope. In some cases, the abrasion techniques can cause cell damage or death at a controlled or predetermined tissue depth.

The invention discloses a lung function training device which comprises a shell, an air outlet end and a blowing nozzle are arranged at the left end and the right end of the shell respectively, a fixing base is arranged on the side, close to the air outlet end, of the inner wall of the shell, a reed is fixedly connected to the side face of the fixing base, and a bypass cavity is formed in the side, close to the blowing nozzle, of the inner wall of the shell. By arranging the shell, the reed and the diaphragm, firstly, a patient actively blows air to impact the reed, so that the reed generates a primary vibration source, when the frequency of pressure pulsation generated by the reed is close to or consistent with the inherent frequency of the diaphragm, the diaphragm enters a resonance state, then the diaphragm generates an ultimate vibration source, vibration is transmitted to the whole shell, and the vibration is transmitted to the whole shell. The high-frequency vibration is utilized to effectively reduce the viscosity and adhesive force of sputum, so that the sputum is loosened from the airway wall, and exhaled air flow generated by blowing can also help the loosened sputum to move towards the oral cavity.

The invention relates to application of tectoridin in preparation of a medicine for treating radiation-induced lung injury. According to the invention, the influence of tectoridin on radiation-induced lung injury is researched by constructing a C57BL / 6 mouse radiation-induced lung injury model; research results prove that the exogenous irisin can relieve alveolar interstitial thickening, hyperemia, pulmonary edema, alveolar collapse, airway wall thickening, airway cavity narrowing and increase of collagen deposition around the airway caused by radiation; besides, the tectoridin obviously reduces lung tissue inflammatory factor synthesis and release, inflammatory cell infiltration and oxidative stress caused by radiation, and obviously reduces lung tissue fibrosis and lung tissue function barrier caused by radiation, the effect of the tectoridin in resisting radiation-induced lung injury is further proved, research and application of the tectoridin are broadened, and the application range of the tectoridin in resisting radiation-induced lung injury is widened. Meanwhile, a new target spot and a new visual field are provided for treating the radiation-induced lung injury.

A device for unblocking and removing secretions from airways, including small airways, by applying oscillated air flow and acoustic vibrations, illustratively according to preprogrammed protocol that defines at least one of frequency, waveform, pressure amplitude, and oscillation duration. In an illustrative embodiment, the device applies a combination of air flow oscillations and acoustic waves to facilitate detachment of mucus from airway walls by matching the resonance of specific airway sections and mucus, amplifying the effect. For optimization, an algorithm illustratively matches the required frequencies, amplitudes, duty cycle, and / or relative phases to specific patient and secretion characteristics.

The invention discloses a sputum suction treatment device for pediatric surgical nursing, which relates to the technical field of sputum suction treatment devices, and comprises a base and support legs for adjusting the horizontal height of the base, and further comprises a body plate arranged on the base and an intubation tube arranged on the body plate and used for going deep into the respiratory tract of a child, the base is provided with a body position adjusting mechanism for adjusting the body position of a child to promote the child to excrete sputum, the body position adjusting mechanism comprises an axis seat fixedly connected to the base, the axis seat is fixedly connected with a positioning worm gear, and the vertical shaft is fixedly sleeved with a swing worm in meshed connection with the positioning worm gear. The body position of a child can be dynamically adjusted, the respiratory tract faces downwards, sputum discharge is promoted through the gravity effect, meanwhile, the arc-shaped elastic bat seat can simulate manual back knocking and loosening of sputum attached to the airway wall, the sputum is more easily coughed out or discharged through a sputum suction pipeline, and the sputum discharge efficiency is remarkably improved.

The present application relates to the field of medical imaging technology, specifically to a COPD early warning method and system based on chest CT parameters, comprising the following steps: based on chest CT image data, extracting pixel data of lung lobe anatomical region, segmenting airway tree structure, identifying bronchial wall boundary, screening gradient change points, and generating airway wall boundary point set. In the present application, by refining the lung lobe anatomical region, segmenting the airway tree structure, accurately positioning the bronchial wall boundary, calculating the airway wall thickness, correcting abnormal fluctuations, improving the stability of the thickness parameter, using the thickness parameter to calculate the airflow passage cross-sectional area, analyzing the lung lobe ventilation volume and ventilation change, quantifying the lung ventilation imbalance degree, screening the ventilation restricted area, analyzing the relationship between the wall thickness and the ventilation change rate, extracting the abnormal growth area, marking the ventilation restriction severity, setting the early warning threshold, calculating the abnormal index mean value, marking the risk area, enhancing the ventilation abnormality recognition hierarchy, and improving the early warning ability of COPD.

The invention relates to the technical field of medical images, in particular to a COPD early warning method and system based on chest CT parameters, and the method comprises the following steps: based on chest CT image data, extracting pixel data of a lung lobe anatomical region, segmenting an airway tree structure, recognizing a bronchial wall boundary, screening gradient change points, and generating an airway wall boundary point set. According to the method, the lung lobe anatomical area is refined, the airway tree structure is segmented, the boundary of the bronchial wall is accurately positioned, the thickness of the airway wall is calculated, abnormal fluctuation is corrected, the stability of the thickness parameter is improved, the sectional area of the airflow channel is calculated through the thickness parameter, the lung lobe ventilation capacity and ventilation change are analyzed, the lung ventilation imbalance degree is quantified, and the ventilation limited area is screened; analyzing the relationship between the wall thickness and the ventilation change rate, extracting an abnormal growth region, calibrating the ventilation limitation severity, setting an early warning threshold value, calculating an abnormal index mean value, marking a risk region, enhancing the ventilation abnormality recognition hierarchy, and improving the COPD early warning capability.

The invention discloses an infant airway collaborative intubation safety control system based on different-place mixed reality. The system aims at solving the problems of space synchronization robustness and predictive time delay compensation in remote guidance, a mapping relation between a local coordinate system and a remote coordinate system is established through a space synchronization module, a long short-term memory (LSTM) network is used for predictive compensation of a remote expert track, and visual lag is eliminated. The core safety mechanism comprises the steps that the airway dynamic model module generates a real-time dynamic signed distance field (D-SDF); the risk prediction module calculates the dynamic collision risk probability of the laryngoscope tail end and the dynamic airway wall in real time. The tactile feedback device responds to the risk probability, adopts a variable admittance control strategy, generates an operation viscous sense by nonlinearly increasing virtual damping, and activates a virtual stiffness item pointing to a safety area when the risk exceeds a critical value, so as to apply a reverse elastic restoring force and realize active safety avoidance in a physical level. And the submillimeter precision and safety of the airway operation of the infant are ensured.

The invention provides an acute respiratory tract obstruction airway unobstructing device, and belongs to the technical field of medical treatment, the device comprises a connecting suction tube, a sputum suction head and a negative pressure suction mechanism, the sputum suction head is arranged at the insertion end of the connecting suction tube, the sputum suction head comprises a suction head front part and a suction head rear part, the suction head front part and the suction head rear part can move relatively in the axial direction, and the suction head front part and the suction head rear part are arranged on the connecting suction tube. The rear portion of the suction head is rotationally connected with the connecting suction pipe, the negative pressure suction mechanism is arranged at the far end of the insertion end of the connecting suction pipe, and a suction hole is formed in the surface of the rear portion of the suction head. An elastic film is arranged in the suction hole, the interior of the elastic film is of an annular double-layer structure, and the opening end of the elastic film is fixedly connected with the inner surface of the suction hole, and through the synergistic effect of the elastic film and the pore diameter adjusting and controlling mechanism, the pore diameter of the suction hole can be automatically adjusted according to the pressure change at the suction hole; airway injury caused by negative pressure adsorption is avoided, and the technical defect that suction holes are adsorbed to the airway wall due to sputum accumulation in the sputum suction process of an existing airway unobstructed device is overcome.

The invention discloses a photoacoustic endoscopic imaging balloon device for a small airway and an application method of the photoacoustic endoscopic imaging balloon device, and belongs to the technical field of medical instruments.The photoacoustic endoscopic imaging balloon device comprises a double-cavity tube, an outer tube and an expandable integrated balloon body, the double-cavity tube is provided with a first channel and a second channel, one end of the first channel penetrates through the balloon body and is closed, and the other end of the first channel penetrates through the balloon body; the other end is provided with an imaging catheter channel; one end of the second channel is communicated with the interior of the balloon body, and the other end is provided with a water injection channel; the outer tube coaxially sleeves the outer side of the double-cavity tube, one end of the outer tube and the balloon body are integrally formed, and a sealing ring is arranged at the other end of the outer tube and used for sealing a gap between the outer tube and the double-cavity tube to prevent liquid leakage. According to the balloon, the balloon body is small in size when not filled, so that the balloon body can enter a narrow airway conveniently; after the liquid medium is injected, the balloon expands and is tightly attached to the airway wall to form a uniform and continuous liquid acoustic coupling layer, so that the signal-to-noise ratio and the stability of photoacoustic imaging are improved, and the problem of insufficient acoustic coupling in the prior art is effectively solved.

The invention discloses application of bifidobacterium animalis in relieving respiratory tract allergy symptoms, and belongs to the technical field of microorganisms. The technical problem to be solved is to provide the application of the bifidobacterium animalis in relieving the respiratory tract allergy symptoms, the key point of the technical scheme is the application of the bifidobacterium animalis subsp. Lactis BL-5M in relieving the respiratory tract allergy symptoms, and the preservation number of the bifidobacterium animalis subsp. Lactis BL-5M is CGMCC (China General Microbiological Culture Collection Center) No.33449. The medicine can act on the core mechanism of respiratory tract allergy, and the sneezing / cough frequency caused by respiratory tract stimulation reflex is reduced; the lung tissue enlargement mediated by allergic inflammation is relieved; the ratio of eosinophilic granulocytes in bronchoalveolus is reduced; the concentration of proinflammatory factors IL-4 and IL-5 in bronchoalveolus alveolus is reduced; inflammatory cell infiltration around the lung airway wall is reduced; the IgE content in a body circulation system or local tissues is reduced, meanwhile, the diversity of intestinal flora is improved, anti-inflammatory functional flora is accurately enriched, and the allergic asthma is improved in a targeted manner.

The invention discloses a disposable laryngeal mask tracheal catheter with an analgesic function, belongs to the technical field of catheters, and aims to solve the problems that an analgesic drug is difficult to directly contact with an airway mucous membrane of a fitting area and only can slowly permeate to a contact part to play a role due to the fact that physical obstruction is formed in the tight fitting area of a cuff and an airway wall. The device comprises a pipeline body, a first sleeve bag is installed on the surface of the pipeline body, a first annular pipe is further installed on the surface of the pipeline body in an embedded mode, and one side of the first annular pipe communicates with a plurality of first medicine spraying pieces. In cooperation with an independent drug delivery system composed of the corresponding first drug spraying piece and the second drug spraying piece, mucous membranes in different areas can be exposed through alternate contraction, and after drug is evenly distributed through the first annular pipe or the second annular pipe, the drug is directly sprayed to a target area from the first drug spraying piece or the second drug spraying piece; and an analgesic blind area caused by physical obstruction of a traditional integrated cuff is avoided.

The application provides an atomizer and an atomization device. The atomization device comprises a battery assembly and an atomizer. The battery assembly is used for supplying power for the atomizer. The atomizer comprises an air passage wall and a flow dividing member. The air passage wall is surrounded to form an air outlet channel. An inner surface of the air passage wall is concavely provided with a mounting groove in communication with the air outlet channel. The flow dividing member is at least partially arranged in the mounting groove. A side of the flow dividing member facing the air outlet channel is provided with a flow dividing portion for dividing condensate. The flow dividing portion is recessed relative to the inner surface of the air passage wall or flush with the inner surface of the air passage wall. According to the application, the flow dividing portion is recessed relative to the inner surface of the air passage wall or flush with the inner surface of the air passage wall, so that the flow dividing portion does not extend into the air outlet channel. The arrangement of the flow dividing portion does not affect the smoothness of airflow, that is, the arrangement of the flow dividing portion does not affect the smoking taste, thereby improving the user's smoking experience.

The invention relates to the technical field of medical instruments, in particular to a diameter-adaptive anesthesia intubation device which comprises a trachea cannula, an adjusting module and a control module. The adjusting module comprises a radial actuating assembly and a detection assembly, the radial actuating assembly is embedded in the trachea cannula, the detection assembly is arranged on the trachea cannula, and the detection assembly is used for detecting the contact pressure between the trachea cannula and the airway wall; the control module is electrically connected with the radial actuating assembly and the detection assembly, and the control module is used for controlling the radial actuating assembly to adjust the tube diameter of the trachea cannula according to the contact pressure detected by the detection assembly. The device has the effect of reducing the risk of airway injury or untight ventilation sealing.

Systems and methods involve abrading a patient lung airway wall to reduce mucus production therein. Exemplary techniques include rotationally and / or linearly oscillating an abrasive material against the airway wall so as to damage mucus producing tissues, for example by removing goblet cells, while destroying less than the entire airway wall. The abrasive material may be present on the surface of an expandable balloon body or another expandable device, which can be delivered to the patient treatment site via a bronchoscope. In some cases, the abrasion techniques can cause cell damage or death at a controlled or predetermined tissue depth.

Systems and methods involve abrading a patient lung airway wall to reduce mucus production therein. Exemplary techniques include rotationally and / or linearly oscillating an abrasive material against the airway wall so as to damage mucus producing tissues, for example by removing goblet cells, while destroying less than the entire airway wall. The abrasive material may be present on the surface of an expandable balloon body or another expandable device, which can be delivered to the patient treatment site via a bronchoscope. In some cases, the abrasion techniques can cause cell damage or death at a controlled or predetermined tissue depth.

The embodiment of the invention provides an aerosol generating substrate section and an aerosol generating product, and the aerosol generating substrate section comprises a peripheral wall and an airway wall; a containing space is defined by the peripheral wall, the peripheral wall has a first length size in the first direction and a second length size in the second direction, the first direction is perpendicular to the second direction, and the first length size is smaller than the second length size; the air channel walls are arranged in the containing space, the containing space is divided into a plurality of airflow channels by the air channel walls, the air channel walls at least comprise the first air channel wall, and the first air channel wall is connected with the two opposite sides of the peripheral wall in the first direction. According to the aerosol generating substrate section, a good suction experience feeling can be provided, and the structural strength is high.

The engine cylinder cover comprises a cylinder cover body and a cover plate, the cylinder cover body is provided with a plurality of air inlet channels, the air inlet ends, corresponding to the air inlet channels, of the cylinder cover body are open ends, and the cover plate is located at the open ends. According to the scheme, the anti-corrosion hydrophobic structure is arranged on the air channel wall of the air inlet channel and comprises the base body layer with the air channel wall as a base body, the anti-corrosion layer and the hydrophobic layer, and the anti-corrosion layer has the characteristic of being compact in structure and can prevent corrosive elements in fuel from permeating into the base body layer so as to prevent the base body layer with the air channel wall as the base body from being corroded and play a role in protecting the air channel wall; the service life of the engine cylinder cover is prolonged; the hydrophobic layer has the hydrophobic characteristic and can reduce attachment of fuel to the wall of the air channel so as to reduce tempering shock caused by fuel attachment to the wall. Due to the fact that the anti-corrosion layer can prevent the air channel wall from being corroded, the risk that the anti-corrosion hydrophobic structure falls off from the air channel wall due to the corrosion of the air channel wall is reduced to a certain degree, and the durability of the formed anti-corrosion hydrophobic structure is improved.

The invention relates to the technical field of medical equipment, in particular to an airway sputum aspirator which comprises a base and a supporting seat rotationally connected to the base, a sputum suction tube assembly is connected to the supporting seat, and a sputum collection bottle is connected to the end of the sputum suction tube assembly; a telescopic piece used for adjusting the inclination angle of the supporting seat is arranged between the base and the supporting seat. A rapping and vibrating mechanism for rapping two sides of the back of the patient is arranged on the supporting seat; and a negative pressure aspirator connected with the sputum collecting bottle is arranged in the supporting seat. Through the arrangement of the sputum suction tube assembly, on one hand, scraping and cleaning of sputum adhering to the airway wall are achieved, on the other hand, disassembly and replacement of the assembly are achieved, the risk of cross infection is avoided, and through the arrangement of the rapping and vibrating assembly, the effect of assisting a patient who cannot autonomously excrete sputum in the sputum suction process to achieve rapid sputum excretion can be achieved; and therefore, the sputum suction efficiency is improved, and the technical problem that the workload is increased due to the fact that some patients need to manually beat the backs by medical staff is solved.

An apparatus for eliminating obstruction of and removing secretions from airways, including small airways, by illustratively applying an oscillating airflow and acoustic vibrations according to a pre-programmed scheme defining at least one of a frequency, a waveform, a pressure amplitude, and an oscillation duration. In one illustrative embodiment, the device applies a combination of airflow oscillations and acoustic waves to facilitate separation of mucus from the airway wall by matching the resonance of particular airway sections and mucus, thereby enhancing the effect. For optimization, the algorithm illustratively matches the required frequency, amplitude, duty cycle and / or relative phase to specific patient and secretion characteristics.

The application provides an acute respiratory tract obstruction airway patency device, belonging to the technical field of medical treatment, comprising a connecting suction pipe, a sputum suction head and a negative pressure suction mechanism, the sputum suction head is arranged at the insertion end of the connecting suction pipe, the sputum suction head comprises a suction head front part and a suction head rear part, the suction head front part and the suction head rear part are relatively movable along the axial direction, the suction head rear part is rotationally connected with the connecting suction pipe, the negative pressure suction mechanism is arranged at the distal end of the insertion end of the connecting suction pipe, and the surface of the suction head rear part is provided with a suction hole; an elastic membrane is arranged in the suction hole, the inside of the elastic membrane is provided with a ring-shaped double-layer structure, and the opening end of the elastic membrane is fixedly connected with the inner surface of the suction hole; through the cooperation of the elastic membrane and the hole diameter control mechanism, the hole diameter of the suction hole can be automatically adjusted according to the pressure change of the suction hole, airway injury caused by negative pressure adsorption is avoided, and the technical defects that the existing airway patency device causes the suction hole to adsorb the airway wall due to sputum accumulation during sputum suction are solved.

The application discloses a kind of based on off-site mixed reality infant airway collaborative intubation safety control system.The system aims to solve the problem of space synchronization robustness and predictive latency compensation in remote guidance, the mapping relationship between local and remote coordinate system is established by space synchronization module, and the trajectory of remote expert is predicted and compensated by using long short-term memory network (LSTM), to eliminate visual lag.The core safety mechanism includes: airway dynamic model module generates real-time dynamic signed distance field (D-SDF);Risk prediction module calculates the dynamic collision risk probability of laryngoscope tip and dynamic airway wall in real time.Tactile feedback device responds to risk probability, adopts variable admittance control strategy, generates operation stickiness by nonlinearly increasing virtual damping, and when risk exceeds the critical value, activates the virtual stiffness term pointing to the safety area to apply reverse elastic restoring force, realize active safety avoidance in physical level, guarantee the sub-millimeter level precision and safety of infant airway operation.