Mask system for inhibiting aerosol generation and method of use thereof

Abstract

The invention provides a mask system for inhibiting aerosol generation and a using method thereof. The mask system comprises a mask and a salt particle generating device. The salt particle generating device is connected to the mask to deliver salt particles into the mask for reducing the amount of aerosol generated by the respiratory tract and / or digestive tract of a mask wearer. The salt particle generating device comprises an atomizing nozzle and a particle size screening device, and the atomizing nozzle can enable a salt solution to form atomized liquid drops. A plurality of screening holes are formed in the particle size screening device, and the particle size screening device at least partially covers the liquid drop outlet of the atomization nozzle so as to screen liquid drops meeting the particle size requirement. The mask system further comprises a solution tank, the solution tank can contain a salt solution, and the solution tank is connected to the salt particle generation device so as to supply the salt solution to the atomization spray head; or the salt particle generating device further comprises a solution containing cavity, the mask system is further connected to a compressed air source, and the compressed air source is used for atomizing the salt solution in the solution containing cavity.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a mask system for suppressing aerosol generation and a method of using the same. Background Art

[0002] During medical examinations and treatments related to the digestive tract and / or respiratory tract, high-intensity droplets / aerosols are easily generated. As the main transmission medium for respiratory infectious diseases, droplets / aerosols pose a risk of infection to medical staff and other patients. During medical operations such as endoscopic examinations, patients often need to wear masks, and the existing mask systems are basically limited to passively blocking the flow and transmission of aerosols through sealing, adsorption, etc., and there are no mask systems that can actively suppress the generation of aerosols.

[0003] Most of the mask systems in the prior art block aerosol transmission by sealing and other means, but the effect of blocking aerosols by sealing alone is limited and often has other adverse effects. For example, when patients undergo painless digestive endoscopy, they often have involuntary high-intensity breathing behaviors such as hiccups, snoring, and coughing, which may release aerosols / droplets with high concentrations of viruses. In particular, for patients who are older (over 55 years old), obese, have a short thyroid-chin distance, and have a high Mallampati grade, they may have difficulty in mask ventilation. After anesthesia, due to the back drop of the tongue root and the collapse of the pharyngeal soft tissue, they are more likely to have high-intensity breathing behaviors such as snoring, that is, they are more likely to produce high-concentration aerosols. If the sealing of the integrated mask is insufficient, its ability to block aerosol transmission will be greatly reduced, and medical staff may be in an aerosol exposure environment for a long time; at the same time, the insufficient sealing of the mask may also cause the patient's oxygen concentration to be uncontrollable, making it difficult to meet the patient's high-flow oxygen supply needs in critical situations, and its ability to block aerosol transmission will be greatly reduced. If the sealing performance of the integrated mask is too high, viral droplets may accumulate in the mask for a long time and inevitably release high-concentration viral aerosols during the extubation process, which may cause medical staff to be directly exposed at close range (usually within 1 meter) instantaneously. At the same time, it may also cause excessive air pressure inside the mask, affecting the doctor's operation of the gastroscope tube, making it difficult to remove the gastroscope tube and reducing the accuracy of gastroscopy.

[0004] Existing devices mainly rely on sealing rings and rubber plugs to passively block the spread of aerosols / droplets in a traditional sealing manner, and do not involve actively inhibiting the generation of aerosols, and cannot fundamentally prevent the occurrence of nosocomial infections during the endoscopic process. Summary of the invention

[0005] This application is made in view of the above-mentioned state of the prior art. The purpose of this application is to provide a mask system for suppressing aerosol generation, which can suppress aerosol generation by delivering salt particles to the respiratory tract and / or digestive tract, thereby reducing the risk of aerosol-transmitted diseases.

[0006] The present application also provides a method for using a mask system for suppressing aerosol generation.

[0007] The present application provides a mask system for suppressing the generation of aerosols, characterized in that it comprises a mask and a salt particle generating device.

[0008] The salt particle generating device is connected to the mask to deliver salt particles into the mask to reduce the amount of aerosol generated in the respiratory tract and / or digestive tract of the mask wearer,

[0009] The salt particle generating device comprises an atomizing nozzle and a particle size filter, wherein the atomizing nozzle can form atomized droplets of the salt solution.

[0010] The particle size filter forms a plurality of screening holes, and the particle size filter at least partially covers the droplet outlet of the atomizing nozzle to screen droplets that meet the particle size requirements.

[0011] The mask system also includes a solution tank, which can hold a saline solution and is connected to the salt particle generating device to supply the saline solution to the atomizing nozzle; alternatively, the salt particle generating device also includes a solution containing chamber, and the mask system is also connected to a compressed air source, which is used to atomize the saline solution in the solution containing chamber.

[0012] In at least one possible embodiment, the mask is a split mask, comprising a nasal mask body and an oral mask body, wherein the nasal mask body (110) and the oral mask body (120) are used to fit the wearer's face respectively without being connected to each other.

[0013] The nasal mask body includes a nasal salt particle interface, and the nasal salt particle interface is connected to the salt particle generating device.

[0014] And / or, the oral mask includes an oral salt particle interface, and the oral salt particle interface is connected to the salt particle generating device.

[0015] In at least one possible embodiment, the salt particle generating device further includes a negative electron generator.

[0016] The negative electron generator includes a circuit board and a discharge plate, wherein the discharge plate is connected to the circuit board and is capable of generating electrons.

[0017] The discharge plate is disposed downstream of the particle size screener, and the electrons generated by the discharge plate can be combined with the salt particles to form negatively charged salt particles.

[0018] In at least one possible embodiment, the discharge plate is formed with a plurality of tip discharge bodies and a plurality of through holes.

[0019] The plurality of tip discharge bodies can generate corona, thereby releasing the electrons,

[0020] The droplets screened by the particle size screener can pass through the through hole and combine with the electrons.

[0021] In at least one possible embodiment, the atomizing nozzle is a refractive micro-nozzle, and the atomizing nozzle includes a nozzle and a refractive part.

[0022] The nozzle is a cone whose diameter gradually decreases from bottom to top, and the top of the nozzle forms a spray outlet.

[0023] The refraction portion is disposed downstream of the nozzle and at a distance from the ejection port.

[0024] In at least one possible embodiment, the mask system further includes a three-way pipe having a one-way valve.

[0025] The nasal mask body includes a nasal salt particle interface, the oral mask body includes an oral salt particle interface, and the salt particle generating device is connected to the nasal salt particle interface and the oral salt particle interface respectively via the three-way pipe.

[0026] The one-way valve can control the communication between the salt particle generating device and the nasal mask and / or the oral mask.

[0027] In at least one possible embodiment, the salt particle generating device further includes an automatic control system, wherein the automatic control system includes a concentration sensor to control the operation of the salt particle generating device by monitoring the concentration of the salt particles delivered into the mask; and / or

[0028] The salt particle generating device further comprises a timer to control the salt particle generating device to automatically turn on and / or turn off.

[0029] In at least one possible embodiment, the particle size of the droplets screened out by the particle size screener is 3.0 to 6.0 microns.

[0030] In at least one possible embodiment, the calculation method of the relevant parameters of the salt particles is:

[0031] The particle size filter is a porous disc, and the salt solution is physiological saline.

[0032] Salt particle settling velocity v p satisfy:

[0033]

[0034] Air flow velocity v through the screening hole a satisfy:

[0035]

[0036] The diameter d of the porous disk satisfies:

[0037]

[0038] in:

[0039] d p is the target particle size of salt particles;

[0040] ρ p is the density of salt particles;

[0041] ρ is the air density;

[0042] μ is the aerodynamic viscosity coefficient;

[0043] Q is the flow rate of the atomizing nozzle;

[0044] N is the number of the screening holes.

[0045] The present application also provides a method for using a mask system for suppressing aerosol generation, which is applicable to the above-mentioned mask system for suppressing aerosol generation.

[0046] The method of use includes:

[0047] Wearing the mask and connecting the mask to other equipment; introducing a salt solution into the salt particle generating device;

[0048] Perform an endoscopic examination while monitoring the patient's condition; the salt particle generating device atomizes the salt solution into salt droplets; the particle size filter screens the salt droplets of qualified size; the salt droplets evaporate into salt particles; and the salt particles enter the mask.

[0049] The mask system for inhibiting aerosol generation provided by the present application generates salt particles through a salt particle generating device. Compared with the strategy of reducing aerosol dispersion and reducing hospital infection risk through sealing in the prior art, the present application uses the means of inhibiting the generation of infectious aerosols in the respiratory tract and digestive tract. Salt particles can enter the patient's respiratory tract and / or digestive tract during the patient's breathing process, and by changing the surface tension of mucus on the surface of the respiratory tract and / or digestive tract, the aerosolization ability of mucus is greatly reduced, thereby achieving the effect of efficiently inhibiting the generation of aerosols. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic structural diagram of a mask system for suppressing aerosol generation according to one embodiment of the present application.

[0051] Figure 2 It is a schematic structural diagram of a split-type mask according to one embodiment of the present application.

[0052] Figure 3 It is a schematic diagram of the inner structure of a split mask according to an embodiment of the present application.

[0053] Figure 4 It is a schematic structural diagram of a nasal mask body according to one embodiment of the present application.

[0054] Figure 5 It is a schematic diagram of the structure of an oral mask body according to one embodiment of the present application.

[0055] Figure 6 It is a schematic diagram of the internal structure of an inspection hole accessory according to one embodiment of the present application.

[0056] Figure 7 It is a schematic structural diagram of another split-type mask according to an embodiment of the present application.

[0057] Figure 8 It is a schematic structural diagram of another inspection hole accessory according to an embodiment of the present application.

[0058] Fig. 9 It is a schematic structural diagram of a salt particle generating device according to one embodiment of the present application.

[0059] Fig.10 It is a schematic diagram of the internal structure of a salt particle generating device according to one embodiment of the present application. Fig.11 It is a schematic structural diagram of an atomizing nozzle according to one embodiment of the present application.

[0060] Fig.12 It is a schematic structural diagram of a particle size filter according to one embodiment of the present application.

[0061] Fig.13 It is a schematic structural diagram of a discharge plate of a negative electron generator according to one embodiment of the present application.

[0062] Fig.14 The present invention is a flowchart of a method for using a mask system according to one embodiment of the present application.

[0063] Description of Reference Numerals

[0064] 100 Split Mask

[0065] 110 Nasal mask

[0066] 111 Oxygen tube interface

[0067] 112 Carbon dioxide monitoring interface

[0068] 113 Nasal Pressure Sensor

[0069] 114 Nasal Salt Particle Interface

[0070] 115 Nose wearing connection

[0071] 116 Nose seal

[0072] 120 Mouth mask

[0073] 121 Endoscopic examination port

[0074] 122 Oral pressure sensor

[0075] 123 Oral Salt Particle Interface

[0076] 124 Mouth-mounted connector

[0077] 125 Mouth seal

[0078] 126 First inspection port accessories

[0079] 1261 Valve Structure

[0080] 1262 Collection Tank

[0081] 127 Second inspection port accessories

[0082] 1271 Filters

[0083] 130 Connectors

[0084] 200 Salt particle generator

[0085] 210 Shell

[0086] 220 Atomizing Nozzle

[0087] 221 Nozzle

[0088] 222 Refraction

[0089] 223 Droplet outlet

[0090] 230 Particle Size Filter

[0091] 240 Negative Electron Generator

[0092] 241 Circuit Board

[0093] 242 Discharge plate

[0094] 2421 Tip Discharger

[0095] 2422 through hole

[0096] 251 Solution delivery pipe

[0097] 252 Salt particle delivery pipe

[0098] 253 Power cord

[0099] 300 Solution tank

[0100] 400 Tee

[0101] 410 Valve DETAILED DESCRIPTION

[0102] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0103] The inner wall surface of the human respiratory tract and / or digestive tract is attached with a mucus layer. The respiratory airflow of respiratory activity and the propulsion / extraction airflow generated by the movement of the endoscope on the mucus layer will form turbulent pulsation in the mucus boundary layer, thereby generating mucus droplets. When the inherent surface tension of the mucus droplets is less than the shear stress applied to them by the airflow, the mucus droplets may detach from the mucus surface (called aerosolization) and migrate from the respiratory tract with the exhaled airflow and eventually exhale out of the body. Studies have found that saline solutions can increase the surface tension of mucus. The greater the surface tension of the mucus, the less likely it is to aerosolize the mucus in the boundary layer, which can reduce the number of viral aerosols (N) generated in the inhalable particle size segment from the source. The method for inhibiting the generation of respiratory aerosols proposed in this application focuses on the risk of hospital infection caused by the exhalation of mucus aerosols in the respiratory and digestive tracts during general anesthesia gastroscopy, and fundamentally reduces the risk of infectious pathogens being released into the hospital environment in a non-invasive manner.

[0104] The embodiment of the present application provides a mask system for suppressing aerosol generation (hereinafter, sometimes referred to as a "mask system"), such as Figure 1 As shown, the mask system may include a mask, a salt particle generating device 200 , and a solution tank 300 .

[0105] Specifically, the mask 100 may be a split mask 100, such as Figure 2 and Figure 3As shown, the split mask 100 may include a nasal mask 110 and an oral mask 120, which may be connected via a connector 130. The nasal mask 110 and the oral mask 120 may be used to fit the wearer's face respectively without being connected to each other, so that the nasal mask 110 and the oral mask 120 can work relatively independently without affecting each other.

[0106] The connector 130 may be a flexible connecting belt, a slot connection, a snap connection, a magnetic connection, or other connection forms. The flexible connecting belt may be a flexible, elastic material such as a cloth material or a rubber material. The slot connection may be designed with a slot interface on the nasal mask 110 or the oral mask 120. The snap connection may be designed with a buckle at the bottom of the nasal mask 110 and a clip at the top of the oral mask 120. The buckle and the clip may be made of the same material as the nasal mask and the oral mask and may be integrally formed. The magnetic connection may be designed with a coaxial male end component and a female end component at the connection portion between the nasal mask 110 and the oral mask 120. Exemplarily, the shape of the male end component and the female end component may be a circle with a diameter less than 5 mm, and the number may be 1-2. The male end component and the female end may be embedded in the surface of the nasal mask or the oral mask, and the male end component and the female end component may be wrapped with an insulating colloid. It can be understood that connecting the nasal mask 110 and the oral mask 120 using a connector 130 with a flexible, slotted, snap-fit, magnetic or other structure can facilitate the patient to wear the nasal mask 110 and the oral mask 120 at the same time when wearing the mask, and can also adjust the wearing position of the nasal mask 110 and the oral mask 120 according to the patient's facial features (the distance between the mouth and the nose, etc.).

[0107] In order to facilitate the description of the specific technical solutions of this embodiment, unless otherwise specified, Figure 2 and Figure 3 The posture of the split mask shown is used as a reference (here only for example, the patient wears the split mask in a standing posture) to define the "up and down" and "left and right" directions. The direction relatively close to the patient's face is the inner side, and the direction relatively far from the patient's face is the outer side. The above orientation definitions are not intended to limit the scope of this application.

[0108] Further, such as Figure 2 , Figure 3 and Figure 4As shown, the nasal mask body 110 may include an oxygen inhalation tube interface 111, a carbon dioxide monitoring interface 112, a nasal pressure sensor 113 and a nasal salt particle interface 114. The nasal mask body 110 may form an oxygen inhalation cavity, which may be a pear-shaped cavity structure with a narrow upper portion and a wide lower portion, and the structure may be well adapted to the patient's face (peri-nasal portion). The oxygen inhalation tube interface 111 may be formed in the middle of the nasal mask body 110, and is used to connect (through a pipeline) an external oxygen supply device to supply oxygen to the nasal mask body 110. The carbon dioxide monitoring interface 112 may be formed near the middle of the nasal mask body 110, and may be formed above the oxygen inhalation tube interface 111 (closer to the nose to facilitate monitoring of nasal exhaled gas), and is used to connect an external carbon dioxide monitoring device to monitor the carbon dioxide content in the patient's exhaled gas, and thus monitor the patient's respiratory state. The nasal pressure sensor 113 can be disposed near the middle of the nasal mask body 110, and can be formed on one side of the oxygen inhalation tube interface 111 in the left and right directions ( Figure 2 and Figure 4 The nasal salt particle interface 114 can be formed near the middle of the nasal mask body 110, and in particular, can be formed on the other side of the oxygen inhalation tube interface 111 in the left-right direction ( Figure 2 and Figure 4 The left side in the figure is used to connect the salt particle generating device 200 to introduce salt particles into the nasal mask body 110 to create a salt particle environment in the nasal mask body 110.

[0109] It can be understood that the oxygen tube interface 111, the carbon dioxide monitoring interface 112, the nasal pressure sensor 113, and the nasal salt particle interface 114 are centrally arranged in the middle position of the nasal mask body 110, that is, the above components are close to the patient's nasal cavity when in use, which can enhance the effect of each component. The nasal salt particle interface 114 is close to the patient's nasal cavity and is closer to the oxygen tube interface 111, which is more conducive to transporting salt particles to the patient's respiratory tract. The oxygen tube interface 111 can achieve high-flow oxygen inhalation for patients through an external oxygen supply device. High-flow oxygen inhalation can improve snoring caused by tongue root fall and pharyngeal soft tissue collapse after anesthesia, and reduce the generation of aerosols. The oxygen tube interface 111 and the external oxygen supply device connected to it can reduce the safety risks of patients with high anesthesia risks with poor upper airway patency or upper airway obstruction. The carbon dioxide monitoring interface 112 and the external carbon dioxide monitoring device connected to it can monitor the patient's respiratory state.

[0110] Further, such as Figure 2 , Figure 3 and Figure 5As shown, the oral mask 120 may include an endoscopic inspection port 121, an oral pressure sensor 122 and an oral salt particle interface 123. The oral mask 120 may form an endoscopic inspection cavity, which may be a hemispherical cavity (including an ellipsoidal shape) that can cover the oral area. The airflow (aerosol) exhaled from the patient's mouth will form a pressure loss in the oral mask 120, and local high-intensity turbulence may be formed near the endoscopic inspection port 121, which may increase the sedimentation rate of large-particle virus aerosols on the inner wall of the cavity. The endoscopic inspection port 121 may be formed in the middle of the oral mask 120 for passing endoscopic inspection equipment such as a gastroscope. The oral pressure sensor 122 may be arranged near the middle of the oral mask 120, and in particular, may be formed on one side of the endoscopic inspection port 121 in the left and right directions ( Figure 2 and Figure 5 The oral salt particle interface 123 can be formed near the middle of the oral mask 120, and in particular, can be formed on the other side in the left-right direction of the endoscopic inspection port 121 ( Figure 2 and Figure 5 ), is used to connect the salt particle generating device 200 to introduce salt particles into the oral mask body 120 to create a salt particle environment in the oral mask body 120.

[0111] It can be understood that the mask system for suppressing aerosol generation of the present application can also include a pressure monitor used in conjunction with the nasal pressure sensor 113 and the oral pressure sensor 122 to monitor and output pressure changes in the mask.

[0112] It can be understood that the oral salt particle interface 123 is closer to the patient's oral cavity, which is more conducive to delivering salt particles to the patient's respiratory tract. Due to the split design of the nasal mask body 110 and the oral mask body 120, the structure of the oral mask body 120 does not need to consider the patient's oxygen inhalation needs, that is, the oral mask body 120 does not need to set a sealing ring or other structures at the endoscopic inspection port 121, so as to facilitate the movement, entry and exit of endoscopic instruments, etc., and can improve the accuracy and convenience of doctors' endoscopic operations.

[0113] The salt particle generating device 200 can create a salt particle environment in the mask in response to the continuous entrainment of the mucus boundary layer by the high-speed airflow in the respiratory tract during breathing behaviors (especially strong breathing behaviors such as coughing, snoring, and hiccups) to produce aerosols. The solid matter remaining after the salt solution droplets evaporate is the salt particles (salt droplet nuclei). The salt particles can be inhaled into the patient's respiratory tract and / or digestive tract during the breathing process, changing the surface tension of the mucus and reducing the aerosolization ability of the mucus. Fig. 9 and Fig.10As shown, the salt particle generating device 200 may include a housing 210, an atomizing nozzle 220 and a particle size filter 230. The housing 210 may be a cylindrical housing, and the atomizing nozzle 220 and the particle size filter 230 may be disposed inside the housing 210.

[0114] Preferably, Fig.11 As shown, the atomizing nozzle 220 may be a refractive micro-sprinkler, and the atomizing nozzle 220 may include a nozzle 221, a refractive portion 222, and a droplet outlet 223. The nozzle 221 may be a cone (cone-like) whose diameter gradually decreases from bottom to top, in particular, a cone, and the top of the atomizing nozzle 221 may form a spray outlet. The refractive portion 222 may be disposed downstream of the nozzle 221 of the atomizing nozzle 220 (i.e., Fig.10 and Fig.11 The droplet outlet 230 may be formed above the refraction portion 222 (at a distance of 1 / 4 in the upper part). Fig.11 For reference), the droplet outlet 230 can be a circular opening. Liquid (such as medical sterile saline) can be sprayed upward from the nozzle 221, and the sprayed water flow encounters the refractive part 22 and is broken into a thin water film and ejected along the four sides. The water film will form fine droplets under the action of air resistance, and the droplets can move upward and be output from the droplet outlet 223. The droplets will gradually evaporate during the movement and only leave solid matter, namely salt particles. The refractive micro-sprinkler has a simple structure, no moving parts, reliable operation, and low price. At the same time, the particle size of the fine droplets it produces is small, which is suitable for creating a salt particle environment. It can be understood that the specific type of the atomizing nozzle 220 is not limited to the above-mentioned refractive micro-sprinkler. The mask system can also use other forms of atomizing nozzle structures, as long as the liquid can be formed into atomized droplets (even if the salt solution can form salt particles).

[0115] Optionally, the atomizing nozzle 220 can be a manual nozzle or an automatic nozzle. When the atomizing nozzle 220 is an electric nozzle, the salt particle generating device 200 can also include corresponding motors, pumps, valves and other structures for supplying the salt particle solution to the nasal mask and / or oral mask through the atomizing nozzle.

[0116] like Fig.10 and Fig.12As shown, the particle size filter 230 can be arranged at the droplet outlet 223 of the atomizing nozzle 220, and the particle size filter 230 can be formed with a plurality of screening holes for screening out fine droplets (salt particles) that meet the particle size requirements. Only droplets with a particle size smaller than the set maximum particle size can pass through the particle size filter 230. The particle size filter 230 can be a porous disc, which can at least partially cover (preferably completely cover) the droplet outlet 223. The aperture of the particle size filter 230 can be determined according to parameters such as the atomizing nozzle flow rate and the target particle size segment of the salt particles. The particle size filter 230 can be made of stainless steel. It can be understood that the salt particle generating device 200 can include a plurality of particle size filters 230 with different apertures for replacement to adapt to different parameter requirements.

[0117] Preferably, Fig.10 and Fig.13 As shown, the salt particle generating device may further include a negative electron generator 240, which may generate negative electrons, and the negative electrons may combine with salt particles to form negatively charged salt particles. The negative electron generator 240 may include a circuit board 241 and a discharge plate 242, the circuit board 241 may be connected to the discharge plate 242, and the discharge plate 242 may be disposed downstream of the particle size filter 230 (at Fig.10 In the figure, the discharge plate 242 is arranged on the upper part of the particle size filter 230). The circuit board 241 may include components such as an LC oscillation circuit (resonance circuit), a high-voltage diode, a capacitor rectifier filter, etc. The circuit board 241 may be externally connected to a low-voltage DC circuit, and the circuit board 241 may increase the low voltage to a negative DC high voltage. The discharge plate 242 may be a porous circular plate, which may include a plurality of tip dischargers 2421 and a plurality of through holes 2422. The tip discharger 2421 may be conical or pyramidal. The tip discharger 2421 may be connected to the circuit board 241, so that the tip discharger 2421 may generate a high corona under the action of the negative DC high voltage, and release a large amount of electrons (negative polarity) at a high speed. The through holes 2422 may pass the droplets (salt particles) screened by the particle size filter 230, and the salt particles may form negatively charged salt particles after combining with the electrons. The discharge plate 241 may be made of materials such as stainless steel, and the tip discharger 2421 may be made of materials such as carbon fiber.

[0118] After the negatively charged polar salt particles are transported into the mask, they can enter the respiratory tract along with human breathing. On the one hand, the salt particles can change the surface tension of respiratory mucus and reduce the aerosolization ability of mucus from the source (in one example, the amount of aerosolized mucus decreased by about 20%). On the other hand, the negatively charged polar particles have a good coagulation effect on submicron particles, which can increase the particle size of aerosolized submicron particles and reduce the amount of exhaled aerosols (in one example, the amount of exhaled aerosols can be reduced by about 1%). The negatively charged polar salt particles in the mask also have an in vitro secondary coagulation effect on the exhaled aerosols, which can further reduce the number of submicron droplet nuclei escaping from the mask (holes and gaps) and reduce the risk of aerosol exposure for medical staff.

[0119] It can be understood that, in another example, the particle size filter 230 and the discharge plate 242 can use the same porous circular plate, that is, the through holes 2422 of the discharge plate 242 can also have the function of screening the particle size of the droplets.

[0120] like Fig. 9 and Fig.10 As shown, the salt particle generating device 200 may also include a solution delivery tube 251, a salt particle delivery tube 252 and a power cord 253. The solution delivery tube 251 may be connected to the solution tank 300 to deliver the solution (e.g., saline) in the solution tank 300 to the salt particle generating device 200. The salt particle delivery tube 252 may be connected to a mask (a split mask 100) to deliver the salt particles generated by the salt particle generating device 200 to the mask, and then deliver the salt particles to the patient's respiratory tract to reduce aerosol generation. The solution delivery tube 251 and the salt particle delivery tube 252 may be silicone hoses, which may form a silicone seal with the nasal mask body 110 and the oral mask body 120, respectively, and may be plugged and unplugged in one direction.

[0121] Preferably, the salt particle generating device 200 can be connected to the nasal salt particle interface 114 of the nasal mask 110 and the oral salt particle interface 123 of the oral mask 120 at the same time. It is understood that the salt particle generating device 200 can also be connected only to the nasal mask 110 or the oral mask 120.

[0122] Preferably, the salt particle delivery tube 252 can be connected to the nasal mask body 110 and the oral mask body 120 through a three-way pipe 400 through a silicone hose. The three-way pipe 400 can be provided with a valve 410 for switching the specific connection form between the split mask 100 and the salt particle generating device 200, that is, switching between connecting only the nasal mask body 110, connecting only the oral mask body 120, and connecting the nasal mask body 110 and the oral mask body 120 at the same time. The valve 410 can be a one-way valve to prevent the liquid in the split mask 100 from flowing back.

[0123] Optionally, the salt particle generating device 200 may be provided with an automatic control system. Exemplarily, the salt particle generating device may be provided with a concentration sensor near the outlet of its salt particle delivery pipe 251 to monitor the concentration of salt particles delivered by the salt particle generating device. When the particle concentration exceeds the upper limit of the set threshold, the atomization function of the salt particle generating device 200 may be stopped; when the particle concentration is lower than the lower limit of the set threshold, the atomization function of the salt particle generating device 200 may be turned on and continue to work until the particle concentration reaches or exceeds the upper limit of the set threshold.

[0124] Preferably, the concentration of salt particles with a mass median aerodynamic diameter (MMAD) of 3.5 μm at the outlet of the salt particle generating device 200 can be continuously monitored. When the concentration of salt particles with MMAD 3.5 μm is 5 μg / cm 3 (micrograms per cubic centimeter), the salt particle generator can be turned off through the built-in feedback control circuit. When the MMAD3.5μm salt particle concentration is lower than 1μg / cm 3 When the temperature is low, the salt particle generator can be turned on.

[0125] Optionally, the salt particle generating device 200 may also be provided with a timer. For example, a typical gastroscopy examination takes 5-10 minutes, and the timer may be set to automatically shut down the salt particle generating device 200 15 minutes after it is turned on, thereby avoiding the doctor's additional workload caused by manually turning the device on and off.

[0126] The solution tank 300 can contain a saline solution. Preferably, the saline solution can be a conventional 0.9% (w / w%, mass percentage) medical sterile saline (NaCl) solution, which can form salt particle droplets that meet the requirements after being atomized by the salt particle generator 200. It can be understood that the saline solution that can be used in the mask system is not limited thereto.

[0127] In another optional embodiment, the salt particle generating device 200 may have a solution holding chamber. The solution holding chamber may be supplied with the salt solution stored in the salt particle generating device 200 for operation. The solution holding chamber may be refilled with salt solution after the salt solution is exhausted. The solution holding chamber may also be connected to an external solution tank for fluid replenishment. The salt particle generating device may also be connected to a compressed air source, and the compressed air may be used to atomize the salt solution in the solution holding chamber. The compressed air source may be a compressed air pump, a compressed air bottle, etc.

[0128] An exemplary method for calculating salt particle related parameters is given below.

[0129] According to the particle size of the screened salt particles, the sedimentation velocity of the salt particles (v p )

[0130] satisfy:

[0131]

[0132] Among them, d p is the target particle size of salt particles; ρ p is the density of salt particles, take 2.17kg / m 3 (kilograms per cubic meter); ρ is the air density, which is 1.2 kg / m 3 ; μ is the aerodynamic viscosity coefficient, which is 17.9×10 -6 Pa·s (Pascal second).

[0133] According to the flow rate of the atomizing nozzle is Q, the number of openings (screening holes) is N, the diameter of the stainless steel disc (particle size filter) is d, and the air flow velocity of each opening (screening hole) is v a

[0134] satisfy:

[0135]

[0136] When the air velocity v a Equal to the salt particle settling velocity v p When the particle size is smaller than the target particle size, the salt particles can pass through the disc, and the particle size screening is completed. The disc diameter d

[0137] satisfy:

[0138]

[0139] Where, Q is the self-regulated atomization device flow rate (5.0-20L / min); d p is the target particle size of salt particles (3.0-6.0 μm); N = 20; ρ p =2.17kg / m 3 ;ρ=1.2kg / m 3 ; μ = 17.9 × 10 -6 Pa·s.

[0140] The calculation basis of the above-mentioned target particle size (3.0-6.0 μm) is: salt particles are the solids remaining after the evaporation of salt solution droplets, that is, salt droplet nuclei. The applicant's research found that the sedimentation rate of droplet nuclei with a particle size of 1.0 μm in the upper respiratory tract is 10.9%, 89.1% can enter the lower respiratory tract, of which 20.4% can penetrate the first five levels of bronchi and enter the small airways. Therefore, if it can be ensured that the median particle size of the droplet nuclei after the evaporation of the atomized salt droplets is ≤1.0 μm, the salt particles can be transported to the patient's upper respiratory tract, trachea and bronchi at all levels, improving the overall properties of the patient's respiratory mucus and effectively reducing the ability of mucus aerosolization. According to calculations, the aerodynamic particle size of the salt droplets corresponding to the 1.0 μm salt particle droplet nucleus is 4.8 μm. Taking into account the secondary evaporation of the droplets in pipeline transportation, the target aperture of the particle size screening device can be appropriately increased, so the target median particle size range is set to 3.0-6.0 μm. Particles in this size range have good flow-following properties and can follow the propulsion airflow generated by the movement of the endoscope into the digestive tract and deposit in the esophagus and cardia.

[0141] Preferably, Figure 2 , Figure 3 and Figure 4 As shown, the nasal mask 110 may also include a nasal wearing connection portion 115, a nasal seal 116 and an elastic band. The nasal mask 110 may include a plurality of nasal wearing connections 115, preferably, the nasal mask 110 may include two nasal wearing connections 115, and the two nasal wearing connections 115 may be respectively arranged on both sides of the bottom of the nasal mask 110. The two nasal wearing connections 115 may be respectively connected to the two ends of the elastic band, and the nasal mask 110 may be worn on the patient's head and / or neck through the elastic band. The nasal seal 116 may be arranged around the edge of the nasal mask 110, and in particular, may be arranged around the inner side of the edge of the nasal mask 110, so that the nasal mask 110 can be closely fitted to the patient's nose. The nasal seal 116 can enhance the sealing of the nasal mask 110 after wearing, reduce the escape of aerosol exhaled from the patient's nasal cavity, and at the same time, it can help adapt to the nasal characteristics of different patients, and enhance the patient's wearing comfort. Preferably, the nose seal 116 may be an airbag cushion, and in particular, may be an airbag cushion integrally formed of a medical polymer material (such as medical liquid silicone), which can reduce gas leakage in the nose mask body 110 .

[0142] like Figure 2 , Figure 3 and Figure 5As shown, the oral mask body 120 may also include an oral wearing connection portion 124, an oral seal 125 and an elastic band. The oral mask body 120 may include a plurality of oral wearing connection portions 124. Preferably, the oral mask body 120 may include two oral wearing connection portions 124, and the two oral wearing connection portions 124 may be respectively arranged on both sides of the middle of the oral mask body 120. The two oral wearing connection portions 124 may be respectively connected to the two ends of the elastic band, and the oral mask body 120 may be worn to the patient's head and / or neck through the elastic band. The oral seal 125 may be arranged around the edge of the oral mask body 120, and in particular, may be arranged around the inner side of the edge of the oral mask body 120, so that the oral mask body 120 may be closely fitted to the patient's oral cavity. The oral seal 125 may enhance the sealing of the oral mask body 120 after wearing, reduce the escape of aerosol exhaled from the patient's oral cavity, and at the same time, it may help adapt to the facial features of different patients, and enhance the wearing comfort of the patient. Preferably, the mouth seal 125 may be an airbag rubber cushion, and in particular, may be an airbag rubber cushion integrally formed of a medical polymer material (such as medical liquid silicone), which can reduce gas leakage in the mouth mask body 120 .

[0143] Preferably, Figure 2 and Figure 3 As shown, the nasal pressure sensor 113 and the oral pressure sensor 122 can be located on the same side of the split mask (for example, both located on the right side). The nasal salt particle interface 114 and the oral salt particle interface 123 can be located on the other side of the split mask (for example, both located on the left side). This arrangement can facilitate the oral mask body and the nasal mask body to form a pipeline connection with the external device respectively, and can avoid or reduce the crossing and tying of the connecting pipelines, so as to improve the convenience of operation and the aesthetics of the device.

[0144] like Figure 2 , Figure 7 As shown, the oral mask body 120 may further include an inspection port accessory, which may be combined with the oral mask body 120 (especially the endoscopic inspection port 121 thereof) by means of a snap (slot) connection, a threaded connection, a magnetic connection, or the like.

[0145] Preferably, the inspection port accessory can be selected as the first inspection port accessory 126 or the second inspection port accessory 127 according to the actual needs of the patient.

[0146] The first inspection port accessory 126 can be suitable for patients without potential mask ventilation difficulties and risk factors, that is, young and middle-aged patients with a body mass index (BMI) ≤ 26 kg / m 2, thyroid-chin distance ≥ 8cm, and patients with anesthesia intubation difficulty airway classification standard (Mallampati) graded as grade I to II. The concentration of viral aerosols released during endoscopic examination in such patients is low, mainly due to the splashing of viral aerosol liquid on the tube wall during endoscopic tube removal. Figure 2 and Figure 6 As shown, the first inspection port accessory 126 can be a hollow cone-like structure, which can include two cone-like structures (or bullet-like structures) that are sleeved. The outer top of the first inspection port accessory 126 (the part away from the wearer's mouth) (the top of the outer cone-like structure) can form a valve structure 1261, and the middle part of the valve structure 1261 can form an opening for passing endoscopic inspection equipment. The valve structure 1261 may include multiple valves (blades) for scraping liquid off the tube wall when the endoscope tube is removed. Exemplarily, the valve structure 1261 in this embodiment includes a total of five valves, and the five valves can be arranged adjacent to each other and partially overlap in sequence. When the endoscope tube is removed, the valve shape is at least partially in contact with the endoscope tube, and the airflow (aerosol) exhaled from the mouth can escape outward from the gap between the valves. The opening direction of the gap between the flaps can be consistent with or close to the radial direction of the endoscope tube. When the escaping airflow and aerosol enter and exit the gap between the flaps, multiple (for example, three) local pressure losses can be formed due to the change in flow path diameter and flow direction. In addition, the inertial collision, turbulent sedimentation and gravity deposition effects of the exhaled aerosol are greatly enhanced, so that the sedimentation rate of the exhaled aerosol on the outer wall of the endoscope tube and the inner surface of the flap structure is greatly increased compared with the conventional inspection port structure. A collection groove 1262 can also be formed between the inner and outer conical structures of the first inspection port accessory 126 (between the double-layer material), that is, the inner bottom of the first inspection port accessory 126 (the part close to the wearer's mouth) forms a collection groove 1262, and the flap structure 1261 can scrape the liquid on the tube wall into the collection groove 1262 when the endoscope tube is removed to prevent liquid reflux or splashing. Exemplarily, the wall thickness of the first inspection port accessory 126 can be 1 mm.

[0147] The second inspection port accessory 127 can be used for patients with potential mask ventilation difficulties and risk factors, i.e., older patients (greater than 55 years old) with a body mass index (BMI) greater than 26 kg / m 2 , thyromental distance <8cm, and the patient's airway grading standard (Mallampati) for the difficulty of anesthesia intubation is graded as above II. (For example, for an elderly patient, routine anesthesia assessment before endoscopy shows that the BMI index is 30kg / m 2, and the thyromental distance is 5cm, Mallampati grading assessment level III, there is a high risk of difficulty in mask ventilation. ) Such patients may have problems such as tongue root falling back after anesthesia and pharyngeal soft tissue collapse leading to snoring during endoscopic examination. The concentration of viral aerosols released is relatively high. In addition to considering the splashing of viral aerosol liquid on the tube wall during the extubation of the endoscopic tube, the escape of viral aerosols during the endoscopic examination should also be considered. It is recommended to choose the second inspection port accessory 127. Figure 7 and Figure 8 As shown, the second inspection port accessory 127 can be an hourglass-shaped (double funnel-shaped), that is, the lower diameter of the second inspection port accessory 127 gradually decreases from bottom to top, and the upper diameter of the second inspection port accessory 127 gradually increases from bottom to top (the upper and lower parts are divided by the axial center of the second inspection port accessory 127). A through hole can be formed in the center of the second inspection port accessory 127 to allow the endoscope tube to pass through. The tapered design of the lower part of the second inspection port accessory 127 can form local high-intensity turbulence in a limited space, which can increase the collision effect between large-particle virus aerosols and the wall surface, and increase the aerosol sedimentation rate. The gradually expanding design of the upper part of the second inspection port accessory 127 can increase the pressure loss of the patient's exhaled airflow and effectively reduce the airflow velocity, so that large-particle virus aerosols settle to the inner wall of the upper part under the action of gravity. As shown Figure 8 As shown, a filter 1271 may be provided inside the middle of the second inspection port accessory 127. Preferably, the filter 1271 may be a disposable filter cotton ring, which may be made of highly absorbent fiber with strong water absorption and low price, and may have a certain absorption and removal effect on the liquid on the wall of the endoscope tube and the patient's exhaled liquid, and may prevent the liquid from flowing back or splashing.

[0148] It can be understood that the mask system for suppressing aerosol generation provided in this embodiment can be applied to a variety of endoscopic examinations, including but not limited to gastroscopy, esophagoscopy, upper gastrointestinal endoscopy, etc. The mask system can also be widely used in various medical examinations, treatments, etc. that require suppression of respiratory and / or digestive tract aerosols.

[0149] The embodiments of the present application also provide a method for using a mask system to suppress aerosol generation, such as Fig.14 As shown, it is suitable for the above-mentioned mask system for suppressing aerosol generation.

[0150] The salt particle generator 200 and the compressed air source or the solution tank 300 can be preset modules set in the use environment. For example, before the general anesthesia endoscopic examination begins, the salt particle generator 200 can be placed near the patient's head on the examination bed, and the solution tank or the compressed air source can be placed under the examination bed or on the endoscope equipment suspension. The silicone hose connected to the salt particle generator 200 and the mask, as well as the nasal mask body 110 and the oral mask body 120 can be disposable items. Connect the relevant electrical equipment to the power supply.

[0151] Before the start of general anesthesia endoscopy, the first inspection port accessories 126 (young and middle-aged, body mass index (BMI) ≤ 26 kg / m) can be selected according to whether the patient has potential mask ventilation difficulties and risk factors. 2 , thyromental distance ≥ 8 cm, patients with anesthesia intubation difficulty airway classification standard (Mallampati) grading assessment of grade Ⅰ to Ⅱ) or second inspection port accessories 127 (older people, body mass index (BMI) > 26 kg / m 2 , thyromental distance <8cm, the patient's anesthesia intubation difficulty airway grading standard (Mallampati) grading assessment is grade II or above), and an endoscopic inspection port 121 connected to the inlet mask body 120.

[0152] Connect the nasal mask 110 and the oral mask 120. Put the nasal mask 110 and the oral mask 120 on the patient. When putting on the nasal mask 110, one hand holds the nasal mask 110 close to the nasal cavity, and the other hand pulls the wearing rope through the patient's head, and adjusts the wearing rope (for example, adjusts its buckle) to make the nasal mask 110 close (seal fit) and adapt to the patient's head circumference. The oral mask 120 fits the patient's mouth without the need for close fit. The wearing rope is worn around the neck and simply fixed.

[0153] The oxygen inhalation tube and the carbon dioxide monitoring tube of the oxygen inhalation device are connected to the oxygen inhalation tube interface 111 and the carbon dioxide monitoring interface 114 of the nasal mask body 110 respectively. One end of the hose 220 of the salt particle generating device 200 is connected to the salt particle interfaces (114, 123) of the nasal mask body 110 and the oral mask body 120, and the other end is connected to the salt particle generating device 200 (three-way interface). The sensor connecting line is connected to the nasal pressure sensor 113 and the oral pressure sensor 122.

[0154] Turn on the salt particle generating device, and pass 0.9% medical saline into the salt particle generating device through the solution tank or add it into the solution containing chamber and not higher than the upper limit of the solution containing chamber.

[0155] After the general anesthesia endoscopic examination begins, the compressed air source or the power of the solution tank is turned on, and the salt particle generator 200 is started. The salt particle generator atomizes the salt solution into salt droplets. The salt droplets of 3-6 μm can pass through the particle size screening plate. If the salt particle generator 200 is equipped with a negatively charged particle generator, it can be started together with the salt particle generator. The tip discharge body of the discharge plate 242 will continue to generate negatively charged particles. The salt droplets passing through the particle size screener 230 can combine with negative electrons when passing through the discharge plate 242 to become negatively charged salt droplets. The negatively charged salt droplets can then be transported to the nasal mask body 110 and the oral mask body 120 through a silicone hose. During the transportation process, the salt droplets continue to evaporate and eventually become salt droplet nuclei (salt particles) with a particle size of ≤1 μm. The salt particles can be inhaled into the respiratory tract and / or digestive tract along with the patient's inhalation, adjust the mucus surface tension, and reduce the number of exhaled droplets.

[0156] The salt particle generator channel outlet has a built-in concentration sensor, which can continuously monitor the salt particle concentration with a mass median aerodynamic diameter (MMAD) of 3.5 μm at the outlet of the salt particle generator 200. When the MMAD3.5 μm salt particle concentration is 5 μg / cm 3 (micrograms per cubic centimeter), the salt particle generator can be turned off through the built-in feedback control circuit. When the MMAD3.5μm salt particle concentration is lower than 1μg / cm 3 When the temperature is low, the salt particle generator can be turned on.

[0157] During endoscopy under general anesthesia, the digestive tract mucus produced by the doctor inserting and removing the endoscope tube can be removed by the valve structure 1261 of the first inspection port accessory 126 or the filter 1271 of the second inspection port accessory 127 to reduce the risk of medical infection caused by mucus aerosolization when the tube is removed.

[0158] After the endoscopy under general anesthesia is completed, the connecting tube between the nasal mask 110 / oral mask 120 and the salt particle generating device 200 is unplugged, and the salt particle generating device is turned off.

[0159] It is understood that the order of the method for using the mask system for inhibiting aerosol generation given above is exemplary, and some steps can be omitted or changed in order in actual operation. The following briefly describes some beneficial effects of the above-mentioned embodiments of the present application.

[0160] The mask system and method of use for suppressing aerosol generation provided by the embodiments of the present application can create a salt particle environment in the mask through a salt particle generating device. The salt particles can enter the patient's respiratory tract and digestive tract during the patient's breathing process, and reduce its aerosolization ability by changing the surface tension of the airway mucus, thereby achieving the effect of suppressing aerosol generation. In particular, the mask system of the present application can use a split mask, and salt particles can be selectively introduced into the nasal mask body and / or the oral mask body according to actual needs. The salt particle generating device can also include a negative electron generator to form the salt particles into negatively charged polar salt particles, further reducing the aerosolization ability of the respiratory and digestive tract mucus.

[0161] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0162] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application.

Claims

1. A mask system for suppressing aerosol generation, characterized in that: comprising a mask and a salt particle generating device (200), The salt particle generating device (200) is connected to the mask to deliver salt particles into the mask to reduce the amount of aerosol generated in the respiratory tract and / or digestive tract of the mask wearer, The salt particle generating device (200) comprises an atomizing nozzle (220) and a particle size filter (230). The atomizing nozzle (220) can form atomized droplets of the salt solution. The particle size filter (230) forms a plurality of screening holes, and the particle size filter (230) at least partially covers the droplet outlet of the atomizing nozzle (220) to filter droplets that meet the particle size requirements. The mask system further comprises a solution tank (300), wherein the solution tank (300) is capable of containing a saline solution, and the solution tank (300) is connected to the salt particle generating device (200) to supply the saline solution to the atomizing nozzle (220); alternatively, the salt particle generating device further comprises a solution containing chamber, and the mask system is further connected to a compressed air source, and the compressed air source is used to atomize the saline solution in the solution containing chamber.

2. The mask system for suppressing aerosol generation according to claim 1, characterized in that: The face mask is a split-type face mask (100), comprising a nasal mask body (110) and an oral mask body (120), wherein the nasal mask body (110) and the oral mask body (120) are respectively adapted to fit the face of a wearer without being connected to each other. The nasal mask body (110) includes a nasal salt particle interface (114), and the nasal salt particle interface (114) is connected to the salt particle generating device (200). And / or, the oral mask (120) includes an oral salt particle interface (123), and the oral salt particle interface (123) is connected to the salt particle generating device (200).

3. The mask system for suppressing aerosol generation according to claim 1, characterized in that: The salt particle generating device (200) further includes a negative electron generator (240), The negative electron generator (240) comprises a circuit board (241) and a discharge plate (242), wherein the discharge plate (242) is connected to the circuit board (241) and is capable of generating electrons. The discharge plate (242) is disposed downstream of the particle size screener (230), and the electrons generated by the discharge plate (242) can be combined with the salt particles to form negatively charged salt particles.

4. The mask system for suppressing aerosol generation according to claim 3, characterized in that: The discharge plate (242) is formed with a plurality of pointed discharge bodies (2421) and a plurality of through holes (2422). The plurality of tip discharge bodies (2421) can generate corona, thereby releasing the electrons, The droplets screened by the particle size screener (230) can pass through the through hole (2422) and combine with the electrons.

5. The mask system for suppressing aerosol generation according to claim 1, characterized in that: The atomizing nozzle (220) is a refractive micro nozzle, and the atomizing nozzle (220) comprises a nozzle (221) and a refractive portion (222). The nozzle (221) is a cone whose diameter gradually decreases from bottom to top, and the top of the nozzle (221) forms a spray outlet. The refraction portion (222) is disposed downstream of the nozzle (221) and at a distance from the ejection port.

6. The mask system for suppressing aerosol generation according to claim 2, characterized in that: The mask system further comprises a three-way pipe (400) having a one-way valve (410). The nasal mask body (110) includes a nasal salt particle interface (114), the oral mask body (120) includes an oral salt particle interface (123), and the salt particle generating device (200) is respectively connected to the nasal salt particle interface (114) and the oral salt particle interface (123) via the three-way pipe (400). The one-way valve (410) is capable of controlling the communication between the salt particle generating device (200) and the nasal mask (110) and / or the oral mask (120).

7. The mask system for suppressing aerosol generation according to claim 1, characterized in that: The salt particle generating device (200) further comprises an automatic control system, wherein the automatic control system comprises a concentration sensor for controlling the operation of the salt particle generating device (200) by monitoring the concentration of the salt particles delivered into the mask; and / or The salt particle generating device (200) further comprises a timer to control the salt particle generating device to automatically turn on and / or off.

8. The mask system for suppressing aerosol generation according to claim 1, characterized in that: The particle size of the droplets screened out by the particle size screener (230) is 3.0 to 6.0 microns.

9. The mask system for suppressing aerosol generation according to claim 1, characterized in that: The calculation method of the relevant parameters of the salt particles is: The particle size filter (230) is a porous disc, the salt solution is physiological saline, Salt particle settling velocity v p satisfy: Air velocity v through the screening hole a satisfy: The diameter d of the porous disk satisfies: in: d p is the target particle size of salt particles; ρ p is the density of salt particles; ρ is the air density; μ is the aerodynamic viscosity coefficient; Q is the flow rate of the atomizing nozzle; N is the number of the screening holes.

10. A method for using a mask system for suppressing aerosol generation, characterized in that: A mask system for suppressing aerosol generation according to any one of claims 1 to 9, The method of use includes: Wearing the mask and connecting the mask to other equipment; introducing a salt solution into the salt particle generating device (200); An endoscopic examination is performed while monitoring the patient's condition; the salt particle generating device (200) atomizes the salt solution into salt droplets; the particle size filter (230) filters the salt droplets of a qualified size; the salt droplets evaporate into salt particles; and the salt particles enter the mask.

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