CN212141186U - Protective head cover - Google Patents
Protective head cover Download PDFInfo
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- CN212141186U CN212141186U CN202020510260.4U CN202020510260U CN212141186U CN 212141186 U CN212141186 U CN 212141186U CN 202020510260 U CN202020510260 U CN 202020510260U CN 212141186 U CN212141186 U CN 212141186U
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- hood
- air
- user
- neck
- air guide
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- 230000029058 respiratory gaseous exchange Effects 0.000 description 14
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Abstract
The utility model relates to a medical instrument, especially a protection hood can seal well, breathes unobstructed, effectively improves travelling comfort and security that the user used, include: a flexible hood having a lower opening around a neck of a user; a mask assembly, comprising: an upper bracket; and a transparent mask mounted to the upper bracket and closely disposed on a front portion of the hood; a neck wrap assembly at least partially surrounding a lower portion of said hood and selectively tightening and loosening said lower opening; an air filtration device, comprising: the filter element, the air inlet pipe communicated into the head cover and the air outlet pipe communicated into the head cover, wherein the effective area of the filter element is larger than 250 square centimeters; an air guide assembly, comprising: the air guide hood is buckled at the mouth and the nose of a user, and the air guide pipe is connected into the air guide hood from the air filtering device.
Description
Technical Field
The utility model relates to a medical appliance, in particular to a protective hood.
Background
The epidemic situation of the novel coronavirus (2019-nCoV) spreads, and with the increase of the number of confirmed people, medical protection is of great importance, not only medical staff who fight the epidemic situation at the first line need protective masks, protective clothing and the like of level N95, but also some staff who provide basic life guarantee (such as taxi drivers, couriers, service staff of supermarkets or restaurants and the like) need better protective measures due to higher infection risk, and in addition, the old or people with chronic diseases have higher proportion to cause serious pneumonia or cause death, so that more strict protective measures are needed when contacting with the outside or other people.
At present, the common protective equipment used in medical treatment, dust and other places is a mask, and protective masks are often used in some special occasions (such as in the environment contacting toxic gas).
Although the mask is convenient to use, there are some problems:
(1) in order to filter viruses, the gaps of the air filter cloth or the filter core of the medical mask are small, the effective area of the air permeable material is small, the air permeability is poor, so that the breathing resistance is large, the breathing is difficult, the breathing is easy to cause discomfort after long-time wearing (for example, the expert suggests that the using time of the N95 mask is not more than 4 hours), and the working comfort of medical staff is influenced. More seriously, because the air passing through has large resistance, the air can be ensured to flow into the mask to be breathed by the user only by large air pressure difference between the inside and the outside, the sealing joint between the mask and the face is easy to be damaged by the large air pressure difference, air leakage can occur at the position with poor sealing, the safety of the mask is influenced, and the health risk is caused to medical personnel working at the epidemic prevention front line for a long time.
(2) The protective area of the mask is small. For medical personnel working in dangerous environments, the protection of eyes and other face and head positions cannot be realized.
(3) The sealing performance of the mask is poor. Because the wearing mode, the face shape and the like are different, the sealing cannot be effectively realized, and the health risk is caused to a wearer.
For the protective mask, the problems of small effective area, poor air permeability and large breathing resistance of the breathable material also exist. Some more professional head-mounted respirators (e.g., fire masks) are complex in structure and use, are not suitable for medical personnel to wear during work, and are not suitable for ordinary people to wear outdoors.
SUMMERY OF THE UTILITY MODEL
According to the utility model discloses an embodiment provides a protection hood, can seal well, breathes unobstructed, effectively improves travelling comfort and the security that the user used.
According to an embodiment of the utility model, provide a protection hood, include:
a flexible hood having a lower opening around a neck of a user;
a mask assembly, comprising: an upper bracket; and a transparent mask mounted to the upper bracket and closely disposed on a front portion of the hood;
a neck wrap assembly at least partially surrounding a lower portion of said hood and selectively tightening and loosening said lower opening;
an air filtration device, comprising: the filter element, the air inlet pipe communicated into the head cover and the air outlet pipe communicated into the head cover, wherein the effective area of the filter element is larger than 250 square centimeters;
an air guide assembly, comprising: the air guide hood is buckled at the mouth and the nose of a user, and the air guide pipe is connected into the air guide hood from the air filtering device.
Preferably, the first and second sensors are, in any embodiment,
the filter element comprises: a filter structure having pores with a diameter of 0.3 microns or less.
Preferably, the first and second sensors are, in any embodiment,
the air filtration device includes an additional physical filter.
Preferably, the first and second sensors are, in any embodiment,
the air filtration device includes an additional chemical filter.
Preferably, the first and second sensors are, in any embodiment,
the inner surface of the face mask includes an anti-fog coating.
Preferably, the first and second sensors are, in any embodiment,
and the active defogging device comprises a defogging pipe which is communicated into the hood.
Preferably, the first and second sensors are, in any embodiment,
an active ventilation system including a ventilation tube that opens into the hood.
Preferably, the first and second sensors are, in any embodiment,
the edge of the scoop comprises a resilient structure.
Through the utility model discloses a protection hood that embodiment provided can seal well, breathes unobstructed, effectively improves travelling comfort and security that the user used.
Drawings
FIG. 1 is a schematic structural view of a protective head cover according to an embodiment of the present invention.
Fig. 2 is a schematic view of an air scoop of a protective headgear according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The main problems of the common mask are as follows: unsmooth breathing and insufficient safety protection performance. The reasons for insufficient safety protection performance are: the edges of the mask seal against the skin and the mask does not protect the eyes and other surfaces/head. On the other hand, some high-grade protective clothing can ensure smooth breathing while playing a role of safety protection, however, the protective clothing is expensive, and is troublesome to use and wear.
The utility model discloses consider the advantage and the shortcoming of gauze mask and protective clothing, provide a safe and reliable, use and dress the convenience, breathe unobstructed protection hood, can be used to satisfy extensive most of demands including civilian and the occasion of doctorsing and nurses.
According to the utility model discloses an embodiment provides a protection hood, can seal well, breathes unobstructed, effectively improves travelling comfort and the security that the user used.
According to an embodiment of the utility model, provide a protection hood, include:
a flexible hood having a lower opening around a neck of a user;
a mask assembly, comprising: an upper bracket; and a transparent mask mounted to the upper bracket and closely disposed on a front portion of the hood;
a neck wrap assembly at least partially surrounding a lower portion of said hood and selectively tightening and loosening said lower opening;
an air filtration device, comprising: the filter element, the air inlet pipe communicated into the head cover and the air outlet pipe communicated into the head cover, wherein the effective area of the filter element is larger than 250 square centimeters;
an air guide assembly, comprising: the air guide hood is buckled at the mouth and the nose of a user, and the air guide pipe is connected into the air guide hood from the air filtering device.
Thus, the protective hood adopts a totally enclosed design, so that the all-round protection of the part above the shoulder of a person is realized, and the flexible hood main body can adapt to different head types of users. The front opening part of the front face of the hood is sealed through a transparent mask, a wide visual field is provided for a user, and the lower opening below the neck of the hood is tightened or loosened through the annular sleeve of the neck sleeve assembly, so that the sealing effect is achieved. The effective area of the filter element (including the filter screen, for example) of the air filter is larger than 250 square centimeters, so that the effective ventilation area is large enough, the smooth breathing can be ensured while the pressure difference between the inner pressure and the outer pressure is small, and the filter screen is easy to replace (different grades of filter screens can be selected according to requirements). The ventilation system of the hood may be optimized aerodynamically for smooth air circulation to improve the user's protective breathing.
In addition, dispose the air guide subassembly in the hood and can further improve the breathing situation, but the user's mouth nose that covers through the air guide cover directly communicates in air filter, forms local comfortable breathing environment for inside breathing air is more unobstructed with external exchange, breathes more easily.
In addition, through the protection hood is with replacing current medical gauze mask, the user need not tighten the gauze mask bandage for strictly preventing the infiltration of bacterium (this often can cause the ear back or face excessively to receive the force or rub and damage), not only improves user comfort level, avoids unnecessary user injury moreover. It should be noted that the air guide cover fastened to the nose and mouth of the user is mainly used to further improve the local breathing environment of the user (as mentioned above), and the edge seal of the air guide cover is not strictly required to fasten the skin of the user, so that the damage to the skin of the user can be significantly reduced.
Therefore, through the utility model discloses a protection hood that the embodiment provided can seal well, breathes unobstructed, effectively improves travelling comfort and security that the user used.
Wherein, the effective area of the filter element of the air filter is as follows: the area which is used for filtering in actual use is far larger than the assembly area after folding or compressing. For example, the effective area of the screen or filter (corresponding to the deployed area) is much larger than the assembly area formed by multiple folds (e.g., wave folds) of the screen or filter.
Preferably, in any embodiment, the cartridge comprises: a filter structure having pores with a diameter of 0.3 microns or less. Therefore, pollutants such as dust particles, bacteria and the like can be effectively filtered.
In one embodiment, optionally, the filter cartridge comprises: a filter structure with pore diameter of 0.1-0.3 μm.
In one embodiment, optionally, the filter element may comprise a HEPA (high efficiency air filter) screen. HEPA filter screen's characteristics are: the air can pass through but fine particles cannot pass through, the removal rate of the air to the particles with the particle size of 0.1-0.3 micrometer reaches 99.7%, the removal rate of the air to the particles with the particle size of more than 0.3 micrometer reaches more than 99.97%, and the air-filtering filter medium is an effective filtering medium for pollutants such as dust particles, bacteria and the like.
In one embodiment, the filter element may optionally comprise a multi-layer construction.
In one embodiment, the filter element may optionally include a layer of fibrous meltblown material to form a barrier filtration layer (e.g., formed by ultra-fine polypropylene meltblown cloth).
In one embodiment, the filter element may optionally include an antimicrobial layer (e.g., formed from a nonwoven fabric or an ultra-thin polypropylene meltblown).
In one embodiment, the filter element may optionally include an electrostatic high density filter layer.
In one embodiment, optionally, the air filtration device includes a cartridge frame for securing the cartridge.
Preferably, in any embodiment, the air filtration device comprises an additional physical filter.
In one embodiment, optionally, the additional physical filter comprises a physical adsorption structure.
Preferably, in any embodiment, the air filtration device comprises an additional chemical filter.
In one embodiment, optionally, the additional chemical filter comprises a chemisorption structure.
Preferably, in any embodiment, the inner surface of the face mask includes an anti-fog coating. Therefore, the influence on the sight caused by the accumulation of water vapor in the breathing air into fog can be effectively avoided.
Preferably, in any embodiment, the shield hood further comprises: and the active defogging device comprises a defogging pipe which is communicated into the hood. In this way, not only is moisture fogging effectively removed, but the interior of the hood can also be kept relatively dry, which is particularly useful in wet or high temperature application environments.
In one embodiment, optionally, the active defogging device includes an electric fan.
In one embodiment, optionally, the active defogging device includes: batteries, electric fans, ducts and air flow distributors. In this way, the airflow distributor can uniformly blow the airflow from the conduit to the inner side of the transparent mask to remove the mist.
In one embodiment, optionally, the nozzles of the air flow distributor emit air towards the mask.
In one embodiment, optionally, the nozzles of the air flow distributor emit air from the top of the head towards the mask.
In one embodiment, optionally, the nozzle of the air flow distributor jets air from below (e.g., the position at the chin of the user's neck) towards the mask.
In one embodiment, optionally, the nozzles of the air flow distributor have an adjustable air injection angle.
In one embodiment, optionally, the nozzle of the air flow distributor sweeps the air jet at a predetermined angular range (e.g., a horizontal angular range or a vertical angular range) towards the mask.
In one embodiment, the nozzles of the air flow distributor optionally sweep the air jets around towards the mask in a horizontal angular range of 0-180 degrees (which may be 0-90 degrees in particular).
In one embodiment, optionally, the nozzle of the air flow distributor sweeps the air jet up and down towards the mask at a vertical angle in the range of 0-90 (and in particular may be 0-60 degrees).
In one embodiment, optionally, the nozzle of the airflow distributor has a circular or flat shape.
In one embodiment, optionally, the nozzle of the airflow distributor comprises a plurality of nozzles.
In one embodiment, optionally, the nozzles of the air flow distributor comprise a plurality of nozzles facing in different directions.
In one embodiment, optionally, the defogging airflow emitted by the airflow distributor is circulated within the interior of the hood.
In one embodiment, optionally, the protective hood further comprises: a dehumidifying device.
Preferably, in any embodiment, the shield hood further comprises: an active ventilation system including a ventilation tube that opens into the hood. In this way, the environment inside the hood can be ventilated more quickly and efficiently, enabling the user to breathe fresh air more easily.
In one embodiment, optionally, the active ventilation system comprises an electrically powered fan.
In one embodiment, optionally, the active ventilation system comprises: the air guide cover comprises a battery, an electric fan, an air inlet pipe (such as an air inlet pipe of an air filtering device introduced into the hood or an air guide pipe introduced into the air guide cover), an air guide cover (such as the air guide cover buckled at the mouth and nose of a user), and an air outlet with a filtering structure (used for preventing outside air from flowing backwards).
In one embodiment, optionally, in an active ventilation system, the electric fan and air intake duct are mounted behind the air intake filter element of the air filter (i.e., downstream side of the air flow), i.e., inside the hood.
Preferably, in any embodiment, the edge of the scoop comprises a resilient structure. In this way, the seal fit may be enhanced by the resilient structure being adaptable to the particular facial shape of different users.
In one embodiment, optionally, the hood has a front opening, the mask closing the front opening.
In another embodiment, optionally, the hood and the face mask are formed as one piece.
In one embodiment, optionally, the upper bracket is at least partially flexible. In this way, the head shapes of different users can be better adapted.
In one embodiment, optionally, an upper bracket is secured to an upper portion of the hood.
In one embodiment, optionally, the upper bracket is secured to the hood by a resilient portion thereof. In this way, the head shapes of different users can be better adapted.
In one embodiment, optionally, the upper bracket comprises: a ring portion surrounding the forehead portion of the user. Thus, the mask can better keep the structural shape and the strength or better close the front opening of the hood through the upper bracket, so that the influence of local structural deformation caused by unstable gravity center on the sealing performance is avoided.
In one embodiment, the mask is optionally connected to the upper bracket by a hinge structure and can be flipped up. Thus, when needed (for example, when medical staff have a rest and have a dinner), the user does not need to take off the whole protective hood and only needs to turn over the mask, so that the time is saved, and the efficiency is improved.
In one embodiment, optionally, the edge of the mask includes an elastic sealing strip. In this way, a snug fit is ensured when the mask closes the front opening of the hood.
In one embodiment, optionally, the edges of the mask include elastic hook and loop fasteners. In this way, a snug fit is ensured when the mask closes the front opening of the hood.
In one embodiment, optionally, the edge of the front opening of the hood is provided with an opening frame. In this way, sealing of the front opening by the mask is facilitated.
In one embodiment, optionally, the neck wrap assembly is at least partially flexible. Therefore, the lower opening can be effectively tightened, and the neck of the user is prevented from being injured.
In one embodiment, optionally, the neck brace assembly comprises: a collar that at least partially surrounds the neck of a user.
In one embodiment, optionally, the neck brace assembly comprises a locking device. Thus, the lower opening of the headgear can be locked in a proper tightening state.
In one embodiment, optionally, the locking means of the neck brace assembly comprises a locking strap.
In one embodiment, the neckloop is optionally made of a flexible, highly elastic material to provide good comfort to the user's neck while ensuring that the opening under the headgear is sealed (e.g., ensuring that the neckloop and neck are in close contact).
In one embodiment, the neck brace assembly optionally includes a highly elastic flexible neck collar and a locking strap.
In one embodiment, optionally, the neck loop has a thickness greater than 10 millimeters. This ensures the comfort of the user.
In one embodiment, optionally, the width of the neck loop is greater than 40 millimeters. This ensures tightness and better user comfort.
In one embodiment, the neck collar may optionally be lengthened or shortened by one size in predetermined step lengths to fit different person neck sizes.
In one embodiment, the neck collar optionally has a folding or telescoping portion, so that one (or more) size can be extended or shortened in predetermined step lengths to fit different persons' neck sizes.
In one embodiment, optionally, in order to improve the comfort, a buffer material layer, such as velvet cloth, may be disposed on the inner surface of the neck ring contacting the skin of the neck of the user to further improve the use comfort of the user.
In one embodiment, optionally, the neck brace assembly comprises: a neck ring (annular sleeve) around the neck of the user inside the hood; and a locking device (e.g., a locking band) located along the neck collar outside the hood. Thus, the neck ring and the locking device clamp the lower portion (i.e., the portion having the lower opening) of the hood from the inside and the outside, respectively. On the one hand a reliable seal between the neck collar and the neck of the user (in particular under the indirect action of the locking force of the locking means) and on the other hand a reliable seal between the neck collar and the lower part of the hood (in particular under the direct action of the locking force of the locking means), so that a relatively safe sealed space is formed within the hood.
In another embodiment, optionally, the neck brace assembly comprises: a neck ring (annular sleeve) which is positioned outside the head cover and surrounds the neck of the user and the lower hem of the head cover; and a locking means (e.g., a locking band) disposed along the neck collar outside the hood. In this way, the neck ring and locking means cooperate to tighten the skirt (i.e., the portion having the lower opening) of the head cover to seal the lower opening of the head cover. Under the locking force of the locking device, the neck of the user, the lap portion of the hood, and the neck ring and the locking device are pressed together to effectively seal the lower opening of the hood, thereby forming a relatively safe sealed space within the hood. Wherein, the neck circle has elasticity, plays elasticity adaptation and supplementary sealed effect.
In one embodiment, optionally, the neck collar and the locking device are formed as a unitary structure.
In one embodiment, an elastic cushioning layer is optionally provided on the inner surface of the skirt of the hood. In this way, a further elastic adaptation (in particular protection of the neck of the user against pressure or friction injuries) and an auxiliary sealing can be achieved.
In one embodiment, optionally, the locking device comprises a hook and loop fastener. In this way, it is possible to facilitate the adjustment of the length of the locking means (e.g. locking strap) when it is most needed.
In one embodiment, optionally, the edge of the lower opening of the hood includes a flexible hook and loop fastener (or so-called hook and loop fastener). Thus, the lower opening portion of the hood can be adhered to the garment portion below the neck of the user by the hook and loop fastener to prevent the loss of the sealing property caused by the accidental waving of the lower hem of the hood.
In one embodiment, optionally, the edge of the lower opening of the hood comprises a metal drop. Thus, the loss of sealing performance caused by the accidental floating of the lower hem of the head cover can be avoided.
In one embodiment, optionally, the air filtration device is mounted to the neck brace assembly.
In one embodiment, optionally, the air filtration device is mounted to the upper bracket.
In one embodiment, optionally, the air filtration device comprises a failure alarm.
In one embodiment, the diameter of the airway tube passing into the airway mask is optionally more than 10 mm to ensure unobstructed breathing.
FIG. 1 is a schematic structural view of a protective headgear according to an embodiment of the present invention (with the air guide assembly omitted for clarity).
Fig. 2 is a schematic view of an air scoop of a protective headgear according to an embodiment of the present invention.
In the embodiment shown in fig. 1 and 2, there is seen a protective hood comprising:
a flexible hood 1 having a lower opening around a neck of a user (a headgear hem 1a provided with the lower opening is illustrated in fig. 1);
a mask assembly 3, comprising: an upper bracket; and a transparent mask mounted to the upper bracket and closely disposed on a front portion of the hood;
a neck wrap assembly 4 which at least partially surrounds the lower portion of the hood and selectively tightens and loosens the lower opening;
an air filtration device 2 comprising: the filter element, the air inlet pipe communicated into the head cover and the air outlet pipe communicated into the head cover, wherein the effective area of the filter element is larger than 250 square centimeters;
an air guide assembly, comprising: an air guide hood 5 buckled at the mouth and nose of a user and an air guide pipe 6 connected into the air guide hood from the air filtering device.
Through the utility model discloses a protection hood that embodiment provided can seal well, breathes unobstructed, effectively improves travelling comfort and security that the user used.
It should be understood that the orientations described herein, such as front, back, left, right, upper, lower, inner, outer, etc., are relative positional expressions used for describing relative positional relationships between the respective related components or portions, and are not intended to limit the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
In the description of the various elements herein, the juxtaposition of the plural features connected by "and/or" means that one or more (or one or more) of these plural features are included. For example, by "a first element and/or a second element" is meant: one or more of the first and second elements, i.e., only the first element, or only the second element, or both the first and second elements (both present).
The various embodiments provided in the present disclosure can be combined with each other as needed, for example, the features of any two, three or more embodiments can be combined with each other to form a new embodiment of the present disclosure, which is also within the scope of the present disclosure, unless otherwise stated or technically contradicted by context, and thus cannot be implemented.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A protective headgear, comprising:
a flexible hood having a lower opening around a neck of a user;
a mask assembly, comprising: an upper bracket; and a transparent mask mounted to the upper bracket and closely disposed on a front portion of the hood;
a neck wrap assembly at least partially surrounding a lower portion of said hood and selectively tightening and loosening said lower opening;
an air filtration device, comprising: the filter element, the air inlet pipe communicated into the head cover and the air outlet pipe communicated into the head cover, wherein the effective area of the filter element is larger than 250 square centimeters;
an air guide assembly, comprising: the air guide hood is buckled at the mouth and the nose of a user, and the air guide pipe is connected into the air guide hood from the air filtering device.
2. The protective hood of claim 1,
the filter element comprises: a filter structure having pores with a diameter of 0.3 microns or less.
3. The protective hood of claim 1,
the air filtration device includes an additional physical filter.
4. The protective hood of claim 1,
the air filtration device includes an additional chemical filter.
5. The protective hood of claim 1,
the inner surface of the face mask includes an anti-fog coating.
6. The protective hood of claim 1 further comprising:
and the active defogging device comprises a defogging pipe which is communicated into the hood.
7. The protective hood of claim 1 further comprising:
an active ventilation system including a ventilation tube that opens into the hood.
8. The protective hood of claim 1,
the edge of the scoop comprises a resilient structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020510260.4U CN212141186U (en) | 2020-04-09 | 2020-04-09 | Protective head cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020510260.4U CN212141186U (en) | 2020-04-09 | 2020-04-09 | Protective head cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212141186U true CN212141186U (en) | 2020-12-15 |
Family
ID=73725414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020510260.4U Active CN212141186U (en) | 2020-04-09 | 2020-04-09 | Protective head cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212141186U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111317929A (en) * | 2020-04-09 | 2020-06-23 | 北京益康生活智能科技有限公司 | Protective head cover |
| CN115475341A (en) * | 2022-05-18 | 2022-12-16 | 丁凯 | Medical protection hood for preventing respiratory infection |
-
2020
- 2020-04-09 CN CN202020510260.4U patent/CN212141186U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111317929A (en) * | 2020-04-09 | 2020-06-23 | 北京益康生活智能科技有限公司 | Protective head cover |
| CN115475341A (en) * | 2022-05-18 | 2022-12-16 | 丁凯 | Medical protection hood for preventing respiratory infection |
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