Breathing protection method and transparent mask

Description

[0001] The invention relates to a method of respiratory protection and a transparent respiratory protection mask with a changeable filter. Background of the invention

[0002] Australian patent application AU2020102286 relates to a respiratory mask assembly comprising a substantially pear-shaped mask body intended to come into contact with the user's face, a stiffening element removably attached to the inner side of the mask body, a mask lining removably attached to the outer side of the mask body, at least one filter assembly for air intake through the mask lining, the mask body, and the stiffening element, and an exhalation assembly forming an air outlet through the mask body. The mask lining has two straps for securing it to the user's head and holding the entire mask assembly in place.

[0003] The Spanish patent application published under number ES 2 778 000 concerns a reusable respiratory protection mask. This mask is designed to be applied to the nose and lower face and secured by means of bands that encircle the ears and head and are connected to two circular lateral protrusions incorporating filters. A protrusion is also provided at the bottom of the mask to accommodate electronic devices. This mask is transparent to facilitate communication and facial recognition; however, it is not adjustable, and its entire perimeter is pressed against the user's face, preventing any jaw movement without causing the mask to lift or shift, resulting in leaks and significantly reducing the mask's effectiveness and reliability.

[0004] The Chinese patent application published under number CN 107 929 967 and the Chinese utility model published under number CN 208 097 144 relate to a respiratory mask comprising: a transparent mask body whose perimeter includes an upper part, a right side part, a left side part and a lower part; a facial contact sealing element located on the perimeter of the transparent mask body; at least one lateral filtration assembly; a right and a left means of securing it to a face, in which: the upper part of the perimeter of the mask body has a right curvature and a left curvature which start from its center, curve downwards and rise upwards, the lower part of the perimeter of the mask body is horizontal, the right and left lateral parts of the mask body are vertical, the right and left retaining means are fixed, at the angles formed between the upper part and the right and left lateral parts of the perimeter of the mask body, respectively; and the membrane protrudes from the mask body with one end fixed to the mask body and one free end, and, at the level of the upper part of the perimeter of the mask body, the free end of the membrane moves away perpendicularly from the mask body.

[0005] In this mask, the sealing element designated by reference 103 is the one most visible on the Figures 5 And 6of these Chinese documents, is a sealing ring, having a U-shaped cross-section whose free ends have been bent towards each other.

[0006] This mask must be attached both to the user's ears and around their neck, which increases the user's feeling of discomfort.

[0007] Its lower section is designed to be held against the user's chin by the 510 fastener. This design has the drawback of making it difficult for the user to speak, and if they do speak, the movement of their lower jaw causes the chin to slip uncomfortably on the sealing ring, compromising the mask's seal. Furthermore, this mask is not designed to allow the user to communicate, as it is equipped with two fans located near the user's ears, which prevents them from clearly hearing ambient sounds.

[0008] Patent no. FR 773 129 describes a respiratory mask. This mask, as stated in the patent description and clearly demonstrated in particular by the figure 4 It is designed to be applied by pressing it onto the user's face. Therefore, it is impossible for the user of such a mask to speak once they have put on their mask.

[0009] The US patent application published under number US2017 / 0007861 proposes a respiratory mask comprising a facial sealing device, intended, as indicated in paragraph

[14] of this application, to surround the nasal and oral regions of the user. As can be clearly seen in particular on the figure 5 The mask, once placed on the user's face, does not allow them to speak.

[0010] The Korean patent application published under number

[0011] KR 2005 0042986 relates to a transparent mask, which is intended to cover the nose and mouth of its user. As is clearly apparent from the figures 2 And 11 Because of this request, the user cannot speak while wearing the mask because any movement of their lower jaw would cause a loss of seal.

[0012] The British patent application published under number GB 2 599 415 relates to a filter cartridge for a respiratory protection device.

[0013] US patent application no. US 2021 / 368877 in particular offers a transparent face mask to cover only the nose and mouth of a user. Summary of the invention

[0014] The main purpose of the invention is to provide a method of respiratory protection using a respiratory protection mask that is transparent, adjustable to the face of its wearer, comfortable, has good breathability, allows the wearer to speak while maintaining its fit to the face and its seal, is reliable and reusable and whose filters can be easily replaced.

[0015] To achieve this goal, the inventor designed a mask whose lower part does not rest against the chin but against the underside of the chin. This allows the user to speak freely without compromising the mask's seal.

[0016] Such a result is obtained by providing that the seal is ensured by a membrane protruding, at the lower part of the perimeter of the mask body, from the perimeter of the mask body to which it is attached, in an upward inclined manner and its free end curves downwards.

[0017] Thus, the positioning and flexibility of the membrane do not interfere much with downward movements of the lower jaw, absorbing these movements which are minor because the membrane is closer to the jaw joint, and all this without inconveniencing the user thanks to the curved end of the membrane, which also allows for sliding and adaptation below the chin while ensuring the mask remains airtight.

[0018] In addition, the curved shape of the mask body further improves the proximity of the free end of the membrane to the lower jaw joint.

[0019] According to the invention, this goal is achieved using a respiratory protection method according to point 1 below: 1. A respiratory protection method comprising the steps of 1) obtaining a mask comprising: a transparent mask body, the perimeter of which includes an upper part, a right side part, a left side part, and a lower part; a membrane located on the perimeter of the transparent mask body; at least one assembly, preferably lateral; a right and a left means of retention; the upper part of the perimeter of the mask body having a right curvature and a left curvature which originate from its center, curve downwards and then upwards, the lower part of the perimeter of the mask body being horizontal, the right and left sides of the mask body being vertical, the right and left means of retention being fixed to the angles formed between the upper part and the right and left sides of the perimeter of the mask body, respectively,and the membrane protruding from the mask body, having one end fixed to the mask body and one free end, and, at the upper part of the perimeter of the mask body, the free end of the membrane extending perpendicularly away from the mask body, and, at the lower part of the perimeter of the mask body, the membrane protruding from the perimeter of the mask body to which it is fixed, inclined upwards with its free end curving downwards; 2) place the mask on the face of a user, positioning the membrane, at the lower part of the perimeter of the mask body, only in contact with the underside of that user's jaw.

[0020] Advantageous features of the method described in point 1 above are indicated in the following points: 2. A respiratory protection method according to point 1, comprising a preliminary step of selecting a mask for the user. 3. A respiratory protection method according to point 3, in which the preliminary step of selecting a mask for the user includes a seal test. 4. A respiratory protection method according to point 3, in which the seal test is carried out using a plug such as a mask fit test plug.

[0021] Indeed, if there is no seal, it means that the mask is poorly fitted, that is to say, poorly positioned on the user's face and / or that its size is unsuitable for the user.

[0022] The assembly is preferably lateral and is preferably a filtration assembly. Preferably, two assemblies are provided, preferably one on each side (right and left) of the mask body.

[0023] The invention also relates to a mask according to point 5 below: 5. A respiratory protective mask suitable in particular for implementing the method according to one of the preceding points, comprising: - a transparent mask body whose perimeter includes an upper part, a right lateral part, a left lateral part, and a lower part; - a membrane located on the perimeter of the transparent mask body; - at least one assembly, preferably lateral; - a right and a left means of retention; • the upper part of the perimeter of the mask body having a right curvature and a left curvature which originate from its center, curve downwards and then upwards, • the lower part of the perimeter of the mask body being horizontal, • the right and left lateral parts of the mask body being vertical, • the right and left means of retention being fixed at the angles formed between the upper part and the right and left lateral parts of the perimeter of the mask body, respectively,and • the membrane protruding from the mask body, having one end fixed to the mask body and one free end, and, at the upper part of the perimeter of the mask body, the free end of the membrane extending perpendicularly away from the mask body, this mask being distinguished in that, at the lower part of the perimeter of the mask body, the membrane protrudes from the perimeter of the mask body to which it is fixed, inclined upwards, with its free end curving downwards.

[0024] Advantageous characteristics of the mask mentioned in point 5 above are indicated in the following points: 6. Mask according to point 5, in which the mask body is curved from top to bottom. 6bis. Mask according to point 5 or 6, in which the mask body is shaped like a portion of a sphere. 7. Mask according to any one of points 5 to 6bis, in which the assembly(ies), preferably lateral, is / are at least partially made of polypropylene (PP) and / or polylactic acid (PLA) and / or polyhydroxyalkanoate (PHA) and / or biopolyester. 7bis. Mask according to any one of points 5 to 7, comprising two assemblies, preferably lateral. 8. A mask according to any one of points 5 to 7bis, in which the assembly(ies), preferably lateral, has a perforated base, a cover having a main side and a lateral wall on only part of its periphery, so as to leave one side open, preferably facing the rear of the mask. 9. A mask according to point 8, further comprising a filter inserted between the cover and the perforated base. 10.Mask according to point 8, further comprising a shutter inserted between the operculum and the perforated base. 11. Mask according to any one of points 5 to 10, wherein, at the lateral parts of the perimeter of the mask body, the free end of the membrane extends perpendicularly away from the mask body and then curves towards the rear of the mask, the right and left sides of the membrane coming together to form a rounded shape. 12. Mask according to any one of points 5 to 11, wherein the width of the membrane increases from top to bottom at the lateral parts and the perimeter of the mask body. 13.A mask according to any one of points 5 to 12, wherein: - the right-hand retaining means forms a loop with the perimeter of the mask body, being also fixed at the junction of the lower and right-hand lateral parts of the mask body, and - the left-hand retaining means forms a loop with the perimeter of the mask body, being also fixed at the junction of the lower and left-hand lateral parts of the mask body. 14. A mask according to any one of points 5 to 13, wherein the retaining means are fixed to the mask body in an adjustable manner. 15. A mask according to point 8, or any one of points 9 to 14 when attached to point 8, wherein each main side is provided with ribs on its base-facing side. 16. Mask according to point 8 or one of points 9 to 15 when they are attached to point 8, in which the opercula are provided at the ends of their lateral walls opposite the main sides, with rims. 17.- Mask according to one of points 9 or 10, or one of points 10 to 16 when attached to point 9 or 10, in which each filter or shutter has a tab. 18.- Mask according to points 5 to 17, in which the side assemblies each form a cassette and / or the filters each form a cartridge, each cassette and each cartridge having the shape of an isosceles trapezoid whose parallel sides have been curved concentrically. 19.- Mask according to point 9, or one of points 11 to 18 when attached to point 9, in which each filter has a frame within which is a porous material.

[0025] It goes without saying that the characteristics of points 5 to 19 also apply to the mask mentioned in the method of points 1 to 4.

[0026] The invention also relates to the use of the mask according to the invention to provide respiratory protection for a person, in which the mask is placed on the person's face, with the membrane positioned, at the lower part of the perimeter of the mask body, only in contact with the lower face of the person's jaw.

[0027] Preferably, this use includes a preliminary step of selecting a mask for that person (the user). This selection step preferably includes a seal test. This is preferably carried out using a valve such as a mask fit test valve.

[0028] In another aspect, the invention also relates to a method for manufacturing the aforementioned mask, the distinctive feature of which is that it includes a bi-injection step. In yet another aspect, the invention relates to a method for testing the seal of a mask with a replaceable filter, in which a shutter is used instead of a filter. This method can be used with any mask with a replaceable filter, and in particular with the mask according to the invention.

[0029] Thus, the mask user inserts a plug, roughly the same size as a filter (such as a mask fit test plug), into the usual filter port. Then, by inhaling and exhaling, they check the mask's seal. This method is easier to implement than previously used techniques and is far more reliable than the method of covering the mask with their hands.

[0030] Other features and advantages of the invention will now be described in detail in the following exposition, which is given with reference to the attached figures, which schematically represent: [ Fig. 1 ] : the mask according to the invention, viewed from the front and fitted to a wearer; ] Fig. 2 ] : the mask of the figure 1 , side view; [ Fig. 3 ] : the mask of Figures 1 And 2 , viewed from the side and below; [ Fig. 4 ] : the mask of the figure 1 , back view, in perspective; [ Fig. 5 ] : the mask of the figure 4 , in exploded view; [ Fig. 6 ] : part of a lateral filtration assembly of a mask according to the invention, before assembly; ] Fig. 7 ] : the part of the figure 6 , after assembly; [ Fig. 8 ] : a complete lateral filtration assembly for a mask according to the invention; [ Fig. 9 ] : a profile view of a user wearing the mask according to the invention; [ Fig. 10 ] : a cross-sectional profile view of the skeleton of a user wearing the mask according to the invention and with their mouth closed; and [ Fig. 11 ] : a cross-sectional profile view of the user's frame of the Figure 10 , the latter now having its mouth open and, consequently, its lower jaw displaced downwards. Detailed description of the invention

[0031] An example of an embodiment of the transparent respiratory protection mask according to the invention is shown in the figures 1 to 11 .

[0032] To fully understand how it works, it's important to note that, medically speaking, a normal mouth opening involves three fingers placed vertically, one above the other. As can be seen on the... Figures 10 and 11The opening of the mouth is achieved by a rocking movement of the lower jaw backwards and downwards due to the complex movement of the temporomandibular joint (TMJ) whose axis makes a complex movement composed of a simultaneous translation and rotation.

[0033] The mask according to the invention incorporates a unique design with the end of the membrane forming a ridge under the lower jaw that perfectly conforms to the shape of the wearer's chin. This ridge flattens and folds back to follow the complex movement of the jaw. The depression created by the ridge when the jaw opens allows the membrane to remain in constant contact with the lower jaw and to absorb the entire movement when the mouth opens. This structure ensures the mask's stability on the face during speech, as the upper part, which rests on the nose, remains perfectly still.

[0034] On the figure 1The mask is shown correctly fitted on a wearer and ready for use. This mask includes, firstly, a transparent mask body 1, rigid or semi-rigid, the perimeter of which includes an upper part 36, a right side part 2, a left side part 3 and a lower part 4.

[0035] The upper part 36 of the perimeter has a right curvature 5 and a left curvature 6 which start from its center 7, curve downwards and then upwards, so as to move towards the tops of the wearer's ears, while following more or less, at a distance, the contour of his eyes.

[0036] The lower part 4 is horizontal while the lateral parts 2 and 3 are approximately vertical.

[0037] This shape allows for a larger contact surface of the mask body 1 on the wearer's face, thus distributing contact pressure more effectively compared to existing masks. Furthermore, it leaves unobstructed the nodal points for human communication—the eyes, nose, and mouth—and the areas used by facial recognition algorithms.

[0038] On the figures 2 And 3 , we see that the mask body 1 is provided with a membrane 8 for facial contact running around the perimeter of the mask body 1.

[0039] The membrane 8 has one end fixed to the mask body 1 and it protrudes from the latter.

[0040] At the upper part 36 of the perimeter of the mask body 1, the free end of the membrane 8, as can be seen in particular on the figure 1, moves away perpendicularly from the mask body 1, in order to reduce visual clutter. Thus, the mask wearer only sees a narrow strip of membrane.

[0041] At the lateral sections 2 and 3 of the perimeter of the mask body 1, the free end of the membrane 8 also extends perpendicularly away from the mask body 1 and then curves towards the rear of the mask, so as to increase the contact surface and allow for the absorption of facial movements. Furthermore, the width of the membrane 8 increases from top to bottom, in order to compensate for the natural thinning of the face and to allow the lower section 4 of the perimeter of the mask body 1 to remain horizontal.

[0042] At this lower part 4 of the perimeter of the mask body 1, the membrane 8 protrudes from the perimeter of the mask body 1 to which it is attached, inclined upwards, and its free end curves downwards, as can be seen in particular on the figure 4 This curvature increases the contact area with the lower jaw, providing a seal at this level as well as stability during the movements of the lower jaw.

[0043] Indeed, as can be seen more clearly in particular on the figure 9 Thanks to its upward-angled section and its downward-curving free end, membrane 8 can absorb downward movements of the lower jaw, while ensuring a seal, and its downward curvature prevents unpleasant pressure against the jaw for the user.

[0044] Moreover, the right and left sides of membrane 8 are visible, particularly on the figures 4 And 5 they move closer together, forming a rounded shape.

[0045] The combination of increasing the width of the membrane 8 at the bottom of the lateral parts 2 and 3 of the perimeter of the mask body 1 and bringing the right and left sides of the membrane 8 closer together at the lower part 4 of the perimeter of the mask body 1 results in a rounded shape that fits the chin of a user, with great adaptability due to the flexibility of the membrane 8.

[0046] By keeping the mask body 1 away from the face, the membrane 8 creates a volume in front of the breathing openings, which facilitates breathing and airflow. Thanks to this, the wearer does not need to exert respiratory effort and can breathe normally.

[0047] As can be seen on the figure 4The mask according to the invention comprises a right-hand retaining means 9 and a left-hand retaining means 10 on the wearer's face, designed to pass around their ears or head. These right-hand retaining means 9 and left-hand retaining means 10 on the face are fixed, on the one hand, to the angles 11 and 12 formed between the upper part 36 and the right lateral parts 2 and left lateral parts 3, respectively, and, on the other hand, to the junctions 13 and 14 of the lower part 4 and the right lateral parts 2 and left lateral parts 3, respectively, of the perimeter of the transparent mask body 1.

[0048] This allows main support of the membrane 8 on the face along the entire upper part 36 of the mask body 1, lighter support of the membrane 8 at the lateral parts 2 and 3 and even lighter support at the lower part 4.

[0049] Preferably, the dimensions of the mask body 1, in particular the length of the lateral parts 2 and 3 of the perimeter, are designed so that the lower part 4 is located below the user's chin, as is clearly shown in the figures 1 to 3 .

[0050] The mask body 1 is generally curved from top to bottom. It can therefore have roughly the shape of a portion of a sphere, which has the advantage of preventing extensive light reflection and leaving a comfortable space in front of the wearer's nose and mouth.

[0051] The membrane 8 allows, on the one hand, the adaptability of the mask body 1 to different faces and, on the other hand, the accommodating of facial movements (speech, grimaces, and other facial expressions), thanks to the stability of the fit. Since the greatest pressure is exerted at the upper part 36, the free end of the membrane is preferably equipped with an additional facial contact element 34, visible in particular on the figure 4 which softens and soothes the pressure on the face.

[0052] The support of the mask body on the face can also be adjusted with the right 9 and left 10 face support means, the length of which can be varied using their attachments to the mask body 1, as can be seen on the figure 4, where the lower parts of the retaining means 10 and 11 are held, at the level of the junctions 13 and 14, by elements forming a clamp inside which the retaining means 9 and 10 can be slid by pulling them in one direction or the other.

[0053] Returning in particular to the figure 1 On each side of the mask body 1, air filtration assemblies 15 and 16 can be seen. Indeed, since the mask body 1 is impermeable and the membrane 8 seals the inside of the mask, it is necessary to allow air to pass through so that the wearer of the mask can breathe normally.

[0054] Air filtration assemblies 15 and 16 are shown in detail on the figure 5 They are each composed of a base 17,18 which is fixed on an opening of substantially the same dimension provided laterally in the mask body 1.

[0055] Bases 17 and 18 have openings 19 and 20 for air inlet and outlet, the air filtration assemblies 15 and 16 then being bidirectional.

[0056] Openings are mounted on the bases 17 and 18. Each opening comprises a main side 21, 22 and, positioned perpendicularly to this, a lateral wall 23, 24 along part of its periphery, leaving one side open for the insertion of the filters 25, 28. Air flows only through this open side, which faces rearward. This prevents the projection of saliva or droplets onto the active surfaces of the filters.

[0057] The main sides 21 and 22 are provided on their faces facing the bases 17,18 with ribs 26,27 intended to create an air circulation volume between the main sides 21,22 of the lids and the filters 25,28 and to form a stabilizing support for the latter.

[0058] The other faces of the main sides 21 and 22, those facing outwards from the mask, can carry various information (name, brand, logo, design...).

[0059] There figure 6 represents the insertion of filter 25 into its lid and the figure 7 filter 25 in normal operating position.

[0060] To facilitate its installation and removal, each filter 25,28 preferably includes a tab 29,30.

[0061] The lids may be provided at the ends of their lateral walls 23, 24 opposite the main sides 21, 22, with rims 31, 32 intended both to come into contact with the bases 17, 18 and to create a filter compartment, as is particularly evident from the figure 6 And 7 .

[0062] In addition, the lids have rivets 33,34 passing through corresponding holes provided in the bases 17,18 (cf. Fig. 8) and attaching to the mask body 1, in order to hold the covers firmly and securely on the mask body.

[0063] It goes without saying that the filters 25,28 are intended to block all the openings 19,20 and that the tabs 19 and 20 preferably remain outside the filtration assemblies so that they can be accessed.

[0064] Preferably, the filters 25,28 have a rigid, impermeable frame 35,36, inside of which is a porous material.

[0065] Thus, the air filtration assemblies 15,16 play the role of a housing cassette and the filters 25,28 play the role of a cartridge.

[0066] Different types of filters can be accommodated to achieve different types of filtration.

[0067] Such a design of the air filtration assemblies 15 and 16 has the advantage of allowing easy change of the filters 25,28 which can also be carried out without having to remove the mask, or even to remove one of the parts constituting it, since it is enough to slide each filter 25,28 inside the filter compartment of the respective air filtration assembly 15,16, between two parallel internal faces of the side walls 23,24, until it comes to rest against the face of the side wall 23,24 opposite the entrance of the filter compartment.

[0068] On the figures 6 And 7 In particular, we see that the filtration sets 15 and 16, in projection onto a plane, have essentially the shape of an isosceles trapezoid whose parallel sides have been curved concentrically, the smallest side of the trapezoid preferably being closest to the center of the virtual circle.

[0069] Filters 25 and 27, excluding tabs 29 and 30, have the same shape. This shape facilitates the insertion of filters 25 and 27 into the filter compartments, thanks to their small curved sides. Materials and manufacturing

[0070] The respiratory protection mask can be manufactured using known materials and, for example, by bi-injection, over-injection, or thermoforming. Preferably, simultaneous or sequential bi-injection of the membrane 8 and the mask body 1 is used.

[0071] The membrane is preferably made of an elastomer such as a thermoplastic elastomer (TPE) and / or a styrenic thermoplastic elastomer (TPE-S) or possibly silicone.

[0072] The mask body 1 is made of transparent injectable plastic or biomaterials.

[0073] The side assemblies 15,16 are at least partially made of polypropylene (PP) and / or polylactic acid (PLA) and / or polyhydroxyalkanoate (PHA) and / or biopolyester.

[0074] The filter frames are generally made of injectable elastomer-thermoplastic materials.

[0075] The porous filter materials vary depending on the type of filtration required. For example, the filter may be made of propylene or an equivalent material for filters against infectious particles.

[0076] The transparent mask according to the invention is preferably available in 3 sizes, so as to fit the majority of human faces and in rarer sizes according to the morphology of certain faces.

[0077] The entire mask, with the obvious exception of the filters, is reusable after disinfection by washing.

Claims

1. Mask comprising: - a transparent mask body (1) whose perimeter comprises an upper part (36), a right side part (2), a left side part (3) and a lower part (4); this mask body (1) being curved from the upper part (36) to the lower part (4), - a membrane (8) located on the perimeter of the transparent mask body (1); - at least one assembly (15, 16); - a right means (9) and a left means (10); • the lower part (4) of the perimeter of the mask body (1) being horizontal, • the right (2) and left (3) side parts of the mask body (1) being vertical, • the right (9) and left (10) means being fixed to the angles (11, 12) formed between the upper part (36) and the right (2) and left (3) side parts of the perimeter of the mask body (1), respectively, and • the membrane (8) protruding from the mask body (1) with one end fixed to the mask body and one free end, and, at the upper part (36) of the perimeter of the mask body (1), the free end of the membrane (8) extending perpendicularly away from the mask body (1), and - the upper part of the perimeter of the mask body (1) comprising a right curve (5) and a left curve (6) which start from its centre (7), curve downwards and rise upwards, characterised in that - at the lower part (4) of the perimeter of the mask body (1), the membrane (8) protrudes from the perimeter of the mask body (1) to which it is attached, upward in an inclined way, and its free end curves downwards, - the size of the mask body (1) is designed so that the lower part (4) is located under the user's chin, and in that the assembly or assemblies (15, 16) is / are at least partially made of polypropylene (PP) and / or polylactic acid (PLA) and / or polyhydroxyalkanoate (PHA) and / or biopolyester.

2. Mask according to claim 1, in which, at the lateral parts (2) and (3) of the perimeter of the mask body (1), the free end of the membrane (8) extends perpendicularly away from the mask body (1) and then curves towards the rear of the mask, with the right and left sides of the membrane (8) moving closer together to form a rounded shape.

3. Mask according to one of claims 1 and 2, comprising two assemblies (15, 16).

4. Mask according to one of claims 1 to 3, in which the assembly or assemblies (15, 16) have a perforated base (17, 18), a cover having a main side (21, 22) and a side wall (23, 24) on only part of its periphery, so as to leave one side open, preferably facing the rear of the mask.

5. Mask according to claim 4, further comprising a filter (25, 28) or a shutter inserted between the cover and the perforated base (17, 18).

6. Mask according to one of claims 1 to 5, wherein: - the right means (9) forms a loop with the perimeter of the mask body (1) by also being attached to the junction (13) of the lower part (4) and the right side part (2) of the mask body (1), and - the left means (10) forms a loop with the perimeter of the mask body (1) by also being attached to the junction (14) of the lower part (4) and the left side part (3) of the mask body (1).

7. Mask according to one of claims 1 to 6, wherein the right (9) and left (10) means are attached to the mask body (1) in an adjustable manner.

8. Mask according to claim 4 or one of claims 4 to 7 when dependent on claim 4, wherein each main side (21, 22) is provided on its side facing the base (17, 18) with ribs (26, 27).

9. Mask according to claim 5 or one of claims 6 to 8, when dependent on claim 5, in which each filter (25, 28) or shutter comprises a tab (29, 30).

10. Mask according to claim 5 or one of claims 6 to 9, when dependent on claim 5, wherein each filter (25, 28) has a frame (35, 36) inside which there is a porous material.

11. Use of a mask according to one of claims 1 to 10 to provide respiratory protection for a user, this mask being placed on the user's face, with the membrane (8) at the lower part (4) of the perimeter of the mask body (1) in contact only with the lower face of the user's jaw.

12. Use according to claim 11, comprising a preliminary step of selecting a mask for the user, this step including a leak test.

13. Use according to one of claims 11 and 12, wherein the width of the membrane (8) of the mask increases from top to bottom at the lateral parts of the perimeter of the mask body (1).

14. Method for manufacturing a mask according to one of claims 1 to 10, comprising a step of dual injection, over-injection or thermoforming.

15. Manufacturing method according to claim 14, comprising simultaneous or sequential dual injection of the membrane (8) and the mask body (1).

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