Respiratory protection method and transparent mask

Abstract

The present invention relates to a respiratory protection method comprising the steps of: 1) providing a mask comprising: a transparent mask body (1) having an edge with an upper portion (36), a right portion (2), a left portion (3), and a lower portion (4), a membrane (8) attached to the edge of the transparent mask body (1), one or more assembly parts (15, 16), a right attachment (9) and a left attachment (10), and 2) placing the mask on a user's face with the membrane (8) in contact with only the underside of the user's chin at the lower portion (4) of the edge of the mask body (1). The present invention also relates to a respiratory protection mask suitable for carrying out the method.

Description

[Technical Field]

[0001] The present invention relates to a respiratory protection method and a transparent respiratory protection mask with a replaceable filter. [Background technology]

[0002] The Australian patent application, published under number AU2020102286, relates to a respiratory mask assembly comprising a generally pear-shaped mask body designed to contact the user's face, a removable reinforcing member attached to the inside of the mask body, a removable mask liner positioned on the outside of the mask body, one or more assemblies forming a filter for air to enter through the mask liner, and an exhaust assembly forming an exit hole for air through the mask body, the mask body and reinforcing member being combined together. The mask liner has two straps that secure it to the user's head and hold the entire mask assembly in place.

[0003] The Spanish patent application, published under the number ES 2 778 000, relates to a reusable respiratory protection mask. The mask is designed to be worn over the nose and lower face, secured by straps that encircle the ears and head and connect to two circular protrusions on the sides that house filters. The lower part of the mask also has protrusions for housing electronic devices. While the mask is transparent to facilitate communication and facial recognition, it lacks adaptability and its entire edge fits snugly against the user's face, causing the mask to lift and move with jaw movement, resulting in leakage 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, are directed to respiratory masks, and include: - 1 transparent mask body with upper, right, left and lower edges; - One face-contact sealing element attached to the edge of the transparent mask body, - one or more lateral filtration assemblies, - one right and one left support for face support, It has the following characteristics: The upper edge of the mask body includes a right curve and a left curve that start from the center, curve downward, and then rises upward again; The bottom edge of the mask body is horizontal, The right and left sides of the mask body are vertical, The right and left intermediate members are attached to the upper part of the edge of the mask body and the corners formed between the right and left sides, respectively; A membrane protruding from the mask body has an end fixed to the mask body and an open end, and above the edge of the mask body, the open end of the membrane extends perpendicularly from the mask body. In the mask, the sealing element designated by reference number 103 and most commonly seen in Figures 5 and 6 of the Chinese document is a sealing ring (English: "sealing ring"), which has a U-shaped cross section with its open ends bent inward toward each other. The mask must be worn around both the ears and the neck of the user, which causes considerable discomfort to the user. Therefore, although the lower part is designed to fit snugly against the user's chin with a fixing device 510, it has the drawback of making it difficult for the user to speak, and even if the user is able to speak, the movement of the lower jaw causes the chin to slide over the sealing ring, which is uncomfortable, and also impairs the sealing of the mask. In any case, the mask is equipped with two fans near the user's ears, making it difficult to accurately hear surrounding sounds, and is not designed for the user to communicate.

[0005] Patent No. FR 773 129 proposes a breathing mask that is designed to be worn by applying pressure to the user's face, as described in the patent specification and as clearly shown in Figure 4. As a result, the user of such a mask is unable to speak once wearing the mask.

[0006] The US patent application published under number US2017 / 0007861 proposes a respiratory mask with a face sealing member designed to surround the user's nose and mouth area, as shown in paragraph

[14] of the present application. As can be seen in Figure 5, once the mask is placed on the user's face, the user is unable to speak.

[0007] The Korean patent application, published under number KR 2005 0042986, is directed to a transparent mask designed to cover the user's nose and mouth. As is evident in Figures 2 and 11 of the application, the user cannot speak while wearing the mask because moving the lower jaw compromises the seal. Summary of the Invention [Problem to be solved by the invention]

[0008] The primary object of the present invention is to provide a method of respiratory protection using a respiratory mask that is transparent, adjustable to fit the user's face, comfortable, easy to breathe through, allows the user to speak while maintaining a good fit and seal on the face, and is reliable, reusable, and has easily replaceable filters. [Means for solving the problem]

[0009] To achieve this goal, the inventor designed the mask so that the bottom of the mask rests on the underside of the chin, rather than on the chin, allowing for free conversation without compromising the mask's airtight seal. This result is achieved by ensuring that the seal is secured by a membrane that protrudes at an upward angle below the edge of the mask body to which it is attached, and whose open end is curved downward. That is, the position and flexibility of the membrane allows for minimal downward movement of the lower jaw, its proximity to the jaw joint allows it to absorb jaw movement, and the curved edges of the membrane allow it to slide and adapt, maintaining a tight seal on the mask without causing discomfort to the user. Additionally, the curved shape of the mask body further increases the proximity of the open end of the membrane to the jaw joint.

[0010] According to the present invention, this object can be achieved by a respiratory protection method according to item 1 below. 1. A method of respiratory protection comprising the steps of: 1) Supplying masks; The mask is: - a transparent mask body whose edges include a top, a right side, a left side and a bottom side; - a membrane provided on the edge of the transparent mask body; - one or more subassemblies, preferably lateral, - right and left support means, the upper portion of the mask body edge includes a right curve and a left curve that start from the center, curve downward, and then rise upward again; the lower portion of the mask body edge is horizontal; the right and left sides of the mask body are vertical; The right and left holding devices are attached to the upper portion of the edge of the mask body and to the corners formed between the right and left sides, respectively; the membrane protruding from the mask body has an end fixed to the mask body and an open end, and at the upper portion of the edge of the mask body, the open end of the membrane extends perpendicularly from the mask body; In addition, at the lower part of the edge of the mask body, the membrane projects from the fixed edge of the mask body so as to be inclined upward and the open end is curved downward; 2) placing the mask on the user's face with the membrane at the lower portion of the mask body rim contacting only the underside of the user's chin.

[0011] Advantageous features of the method of item 1 above are presented in the following items. 2. A respiratory protection method as described in item 1, including the preliminary step of selecting a mask for the user. 3. The respiratory protection method according to item 3, wherein the preliminary step of selecting a respirator for the user includes a seal test. 4. The respiratory protection method according to item 3, wherein the seal test is carried out using a barrier, such as a barrier for testing the adjustment of a mask. If there is no seal, it means the mask does not fit properly, i.e., it is not positioned correctly on the user's face and / or is the wrong size. The assemblies are preferably lateral and are preferably filtering assemblies, preferably one on each side (right and left) of the mask body.

[0012] The present invention also relates to a mask according to item 5 below. 5. A respiratory protective mask particularly suitable for carrying out the method according to any one of the preceding items, said mask comprising: a transparent mask body having an edge with a top, a right side, a left side and a bottom; - a membrane provided on the edge of the transparent mask body; - one or more subassemblies, preferably lateral, - right and left support means, the upper portion of the mask body edge includes a right curve and a left curve that start from the center, curve downward, and then rise upward again; the lower portion of the mask body edge is horizontal; the right and left sides of the mask body are vertical; The right and left holding devices are attached to the upper portion of the edge of the mask body and to the corners formed between the right and left sides, respectively; the membrane protruding from the mask body has an end fixed to the mask body and an open end, and at the upper portion of the edge of the mask body, the open end of the membrane extends perpendicularly from the mask body; The mask is characterized in that, at the lower part of the edge of the mask body, the membrane protrudes from the fixed edge of the mask body so as to slope upward and the open end is curved downward.

[0013] The advantageous features of the mask in item 5 above are shown in the following items. 6. The mask according to item 5, wherein the mask body is curved from the upper portion to the lower portion. 6-2. The mask according to item 5 or 6, wherein the mask body has a spherical shape. 7. The mask according to any one of items 5 to 6-2, wherein one or more of the assembly parts, preferably the lateral parts, are at least partially made of polypropylene (PP) and / or polylactic acid (PLA) and / or polyhydroxyalkanoate (PHA) and / or biopolyester. 7-2. A mask according to any one of items 5 to 7, comprising two of the assembly parts, preferably lateral. 8. The mask according to any one of items 5 to 7-2, wherein one or more of the assembly parts comprises an open base, a lid body having a main surface, and a side wall around only a portion of the periphery thereof, preferably toward the rear of the mask, to leave one side open. 9. The mask of item 8, further comprising a filter inserted between the lid and the open base. 10. The mask of item 8, further comprising a barrier inserted between the lid and the open base. 11. The mask according to any one of items 5 to 10, wherein at the side portions of the edge of the mask body, the open ends of the membrane extend perpendicular to the mask body and then curve toward the rear of the mask, and the right and left sides of the membrane approach each other while forming rounded portions. 12. The mask according to any one of items 5 to 11, wherein the width of the membrane increases from top to bottom at the side of the edge of the mask body. 13. A mask according to any one of items 5 to 12, - the right intermediate member is also fixed to the joint between the lower portion and the right side portion of the mask body, and forms a loop together with the edge of the mask body; - A mask in which the left intermediate member is also fixed to the joint between the lower portion and the left side portion of the mask body and forms a loop together with an edge of the mask body. 14. The mask according to any one of items 5 to 13, wherein the retention means is attached to the mask body in an adjustable manner. 15. A mask according to item 8, or any one of items 9 to 14 when dependent on item 8, wherein each of the main surfaces has a rib on the side facing the base. 16.- A mask according to item 8 or any one of items 9 to 15 when dependent on item 8, wherein the lid body has a flange at the end of the side wall opposite the main surface. 17.- A mask according to item 9 or 10, or any one of items 10 to 16 when dependent on item 9 or 10, wherein each of the filters or the barriers includes a tab portion. 18.- A mask according to any one of items 5 to 17, in which the lateral subassemblies are each cassettes and / or the filters are each cartridges, each cassette and each cartridge having the shape of an isosceles trapezoid with parallel sides curved concentrically. 19.- A mask according to item 9 or any one of items 11 to 18 when dependent on item 9, in which each filter has a frame with a porous material inside. It goes without saying that the features of items 5 to 19 also apply to the masks mentioned in the methods of items 1 to 4.

[0014] The present invention also relates to the use of a mask, in accordance with which the mask is placed on a person's face to provide respiratory protection to the person, with a membrane positioned below the edge of the mask body so that it contacts only the underside of the person's chin. Preferably, this includes a preliminary step of selecting a mask for the person (user), which preferably includes a seal test, which is preferably performed using a barrier, such as a barrier for fitting tests of the mask.

[0015] According to another aspect, the present invention also relates to a manufacturing process for the aforementioned mask, characterized by a double injection molding step. According to yet another aspect, the present invention relates to a method for testing the seal of a mask with a replaceable filter, which uses a barrier instead of a filter. The method can be used for any mask with a replaceable filter, in particular a mask according to the present invention. For example, a mask wearer can insert a barrier roughly the same size as the filter, such as a mask adjustment test barrier, into the location where a filter would normally be placed, and breathe in and out to check the mask seal. This method is easier to perform than previously used techniques and is far more reliable than clasping the mask with one's hand. [Effects of the Invention]

[0016] Other features and advantages of the present invention will be explained in detail in the following description, with reference to the accompanying drawings, which show, in brief: [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a mask according to the present invention worn by a user. [Figure 2] The mask in Figure 1 seen from the side. [Figure 3] The mask of Figures 1 and 2 viewed from the side and below. [Figure 4] The mask in Figure 1, in perspective, seen from behind. [Figure 5] Exploded view of the mask in Figure 4. [Figure 6] 1 shows a portion of a side filter unit of a mask according to the invention before assembly. [Figure 7] The part in Figure 6 after assembly. [Figure 8] 1 shows a fully filtering lateral unit of a mask according to the invention. [Figure 9] FIG. 2 is a side view of a mask according to the present invention worn by a user. [Figure 10] 1 is a cross-sectional side view of a user's anatomy with the mouth closed and wearing a mask according to the present invention. [Figure 11] 11 is a cross-sectional side view of the user's skeleton of FIG. 10 with the user opening their mouth, thereby causing the lower jaw to move downward. DETAILED DESCRIPTION OF THE INVENTION

[0018] <Detailed Description of the Invention> One embodiment of a transparent respiratory mask according to the present invention is shown in Figures 1 to 11. To understand how this works, medically speaking, the width of a mouth opening is usually equivalent to the width of three fingers stacked vertically. As can be seen in Figures 10 and 11, when you open your mouth, the axis of the temporomandibular joint (TMJ) undergoes complex movements that simultaneously involve translational and rotational movements, causing the lower jaw to tilt backward and downward. Therefore, the mask of the present invention incorporates a unique design in which the end of the membrane forms a slack under the lower jaw, perfectly conforming to the shape of the user's jaw and having the special property of flattening and moving backward in accordance with the complex movement of the jaw. When the jaw is opened, the slack collapses, allowing the membrane to continue to contact the lower jaw while maintaining a tight seal, allowing the mask to fully absorb the movement when the mouth is opened. Thanks to this structure, the upper part placed on the nose does not move, and the mask stays stable on the face when speaking.

[0019] Figure 1 shows a mask properly fitted by a user and ready for use, which initially comprises a rigid or semi-rigid transparent mask body 1, the edges of which are made up of an upper portion 36, a right portion 2, a left portion 3 and a lower portion 4. The upper portion 36 of the rim has a right curvature 5 and a left curvature 6, both of which start at the center 7 to maintain a certain distance from the contours of the user's eyes, curve downward, and then rise upward toward the tops of the user's ears. The bottom portion 4 is horizontal and the sides 2 and 3 are approximately vertical.

[0020] The shape of this feature increases the area of ​​contact of the mask body 1 with the wearer's face, thereby distributing contact pressure more evenly compared to known masks. Furthermore, the shape of this feature frees up areas that are important for human communication, such as the eyes, nose, and mouth, as well as areas used for facial recognition algorithms.

[0021] 2 and 3 show that the mask body 1 is provided with a membrane 8 for contacting the face, which membrane runs around the periphery of the mask body 1. The membrane 8 has one end fixed to the mask body 1 and protrudes from the mask. At the upper edge 36 of the mask body 1, as can be seen particularly in Figure 1, the open end of the membrane 8 is spaced perpendicular to the mask body 1 to reduce visual obstruction, thereby minimizing the width of the membrane seen by the mask user. At the sides 2 and 3 of the edge of the mask body 1, the open ends of the membrane 8 also extend perpendicular to the mask body 1 and then curve towards the rear of the mask, increasing the contact area and allowing it to absorb facial movements. Furthermore, to compensate for the natural narrowing of the face, the width of the membrane 8 increases from top to bottom so that the lower part 4 of the edge of the mask body 1 remains horizontal. 4, in the lower portion 4 of the edge of the mask body 1, the membrane 8 protrudes from the edge of the fixed mask body 1 at an upward incline, and its open end is curved downward. This curvature increases the contact surface with the mandible, providing a tight seal and stability for the mandible during mandibular movement. That is, as shown in particular in FIG. 9, thanks to the upwardly sloping portion and downwardly curved open end, the membrane 8 can absorb downward movement of the lower jaw while maintaining a tight seal, and the downward curvature avoids pressure on the jaw which may be uncomfortable for the user. Furthermore, the right and left sides of the membrane 8, particularly as shown in Figures 4 and 5, are rounded and close together. The width of the membrane 8 is increased at the lower parts of the sides 2 and 3 of the edge of the mask body 1, and further the left and right sides of the membrane 8 are brought closer together at the lower part 4 of the edge of the mask body 1, thereby making the most of the excellent adaptability due to the flexibility of the membrane 8 and obtaining a rounded shape that fits the user's chin. By keeping the mask body 1 at a distance from the face and the membrane 8 creating a volume in front of the breathing holes, breathing and air circulation are facilitated. This eliminates the need for the user to strain their breathing and allows for normal breathing.

[0022] 4, the mask according to the present invention comprises a right intermediate member 9 and a left intermediate member 10 for holding the mask on the user's face, which are designed to pass around the user's ears or head. The right intermediate member 9 and the left intermediate member 10 are fixed to the corners 11 and 12 formed between the upper portion 36 and the right and left portions 2 and 3, respectively, on the one hand, and are fixed to the joints 13 and 14 between the lower portion 4 of the edge of the transparent mask body 1 and the right and left portions 2 and 3, respectively, on the other hand. This results in the membrane 8 providing the main support along the entire upper portion 36 of the mask body 1, with the membrane 8 providing less support at the sides 2 and 3 and even less support at the lower portion 4. Preferably, the dimensions of the mask body 1, in particular the length of the frame sides 2 and 3, are designed so that the lower part 4 is positioned under the user's chin, as is clear from Figures 1 to 3. The mask body 1 is generally curved from top to bottom, so that it can be shaped like a part of a sphere, which has the advantage of preventing the spread of light reflection and leaving a comfortable space in front of the user's nose and mouth.

[0023] The membrane 8 allows the mask body 1 to adapt to different facial surfaces and also allows facial movements (speaking, frowning, other expressions) due to the stability of the fit. Since the greatest pressure is exerted at the top 36, the open end of the membrane preferably has an additional face-contacting material 34 to smooth and cushion pressure on the face, as shown particularly in FIG. The support of the mask body to the face can also be adjusted by means of intermediate members on the right side 9 and left side 10 of the face, the length of which can be changed by fasteners to the mask body 1 as shown in Figure 4, and in this position the lower parts of the intermediate members 10 and 11 are held at joints 13 and 14 by clamp-like members which can be slid by pulling the intermediate members 9 and 10 in one direction or the other.

[0024] 1 in particular, air filter assemblies 15 and 16 are shown on either side of mask body 1. Because mask body 1 is impermeable and membrane 8 seals the interior of the mask, air must be able to pass through to allow the mask user to inhale and exhale normally. The air filter assemblies 15 and 16 are shown in detail in Figure 5. The assemblies are mounted on bases 17, 18, respectively, which are secured to openings of approximately the same size in the sides of the mask body 1. The bases 17 and 18 have openings 19 and 20 for air entry and exit, and the air filter assemblies 15 and 16 are two-way. The lids are mounted on bases 17 and 18. Each lid has a main surface 21, 22 and side walls 23, 24 arranged at right angles thereto, arranged around a portion of the periphery, with one side open for the introduction of a filter 25, 28. Air flows only through the side that opens towards the rear, which prevents spray or droplets from splashing onto the active surface of the filter. The main surfaces 21 and 22 are provided with ribs 26, 27 on the surfaces facing the bases 17, 18, and are designed to provide an air circulation space between the main surfaces 21, 22 of the lid and the filters 25, 28 and to provide stable support therebetween. On the other side of the main faces 21 and 22, ie the outward facing side of the mask, various information (name, brand, logo, drawing) can be displayed.

[0025] FIG. 6 shows the filter 25 inserted into the lid, and FIG. 7 shows the filter 25 in its normal use position. To facilitate attachment and detachment, each filter 25, 28 preferably includes a tab portion 29, 30. As shown in particular in Figures 6 and 7, the ends of the side walls 23, 24 opposite the main surfaces 21, 22 may be provided with flanges 31, 32 which contact the bases 17, 18 and form a filter compartment. Furthermore, the lid is provided with rivets 33, 34 which pass through corresponding holes in the bases 17, 18 (see Figure 8) and are fastened to the mask body 1 to securely and rigidly fasten the lid to the mask body. It will be appreciated that filters 25, 28 are preferably designed to completely cover openings 19, 20, with tab portions 19, 20 remaining outside the filter assembly for access. Preferably, the filters 25, 28 have a rigid, impermeable frame 35, 36 with a porous material inside. In this manner, the air filter assemblies 15, 16 function as receiving cassettes and the filters 25, 28 function as cartridges. By installing different types of filters, different types of filtration can be achieved. The design of these filter assemblies 15, 16 has the advantage that the filters 25, 28 can be easily replaced without removing the mask or disassembling any components, as each filter 25, 28 can be simply slid between the two parallel inner faces of the side walls 23, 24 in the filter compartment of the respective air filter assembly 15, 16 until it abuts against the face of the side wall 23, 24 facing the inlet of the filter compartment. 6 and 7, in particular, when projected onto a plane, filter assemblies 15 and 16 have the shape of an isosceles trapezoid with substantially parallel sides curved concentrically, preferably with the shorter side of the trapezoid near the center of the imaginary circle. The filters 25 and 27 also have the same shape, ignoring the tabs 29 and 30. This shape makes it easier to insert the filters 25 and 27 into the filter compartment.

[0026] <Materials and Manufacturing> The respiratory protection mask can be manufactured from known materials, for example by double injection molding, additive injection molding, or thermoforming. Preferably, simultaneous or sequential double injection molding is used for the membrane 8 and the mask body 1. The membrane preferably uses an elastomer such as a thermoplastic elastomer (TPE) and / or a styrenic thermoplastic (TPE-S) or, optionally, a silicone. The mask body 1 uses a plastic material or a transparent injectable biomaterial. The lateral assemblies 15, 16 are at least partly made of polypropylene (PP) and / or polylactic acid (PLA) and / or polyhydroxyalkanoate (PHA) and / or biopolyester. Filter frames are generally made of elastomeric or thermoplastic injectable materials. The porous filter material will vary depending on the type of filtration desired, for example, an infectious particle filter can be made of propylene or an equivalent material.

[0027] Transparent masks according to the present invention preferably come in three sizes to fit the majority of faces, with some less common sizes available to accommodate specific facial shapes. The entire mask, except for the filter, is reusable after disinfection by washing.

Claims

1. 1. A method of respiratory protection comprising the steps of: 1) Providing masks; The mask is: a transparent mask body (1) whose edge comprises an upper part (36), a right part (2), a left part (3) and a lower part (4); - a membrane (8) provided on the edge of the transparent mask body (1), - one or more subassemblies (15, 16), - a right intermediate tool (9) and a left intermediate tool (10), the upper part of the edge of the mask body (1) includes a right curve (5) and a left curve (6) that start from its center (7), curve downwards, and then rise again upwards; - the lower part (4) of the edge of the mask body (1) is horizontal; the right side (2) and the left side (3) of the mask body (1) are vertical; The right intermediate member (9) and the left intermediate member (10) are attached to the upper portion (36) of the edge of the mask body (1) and the corners (11, 12) formed between the right side portion (2) and the left side portion (3), respectively; the membrane (8) protruding from the mask body (1) has an end fixed to the mask body and an open end, and in the upper part (36) of the edge of the mask body (1), the open end of the membrane (8) extends perpendicularly from the mask body (1); - in the lower part (4) of the edge of the mask body (1), the membrane (8) projects from the edge of the fixed mask body (1) in such a way that it slopes upward and the open end curves downward; the mask body (1) is curved from the upper portion (36) to the lower portion (4), the lower portion (4) being dimensioned to be positioned under the user's chin; 2) placing the mask on the user's face with the membrane (8) in contact with only the underside of the user's chin at the lower part (4) of the edge of the mask body (1).

2. 10. The respiratory protection method of claim 1, including the preliminary step of selecting a mask for a user.

3. 3. The respiratory protection method of claim 2, wherein the preliminary step of selecting a respirator for a user includes a seal test.

4. 4. The respiratory protection method of claim 3, wherein the seal test is performed using a barrier.

5. A mask comprising: a transparent mask body (1) whose edge comprises an upper part (36), a right part (2), a left part (3) and a lower part (4); - a membrane (8) provided on the edge of the transparent mask body (1), - one or more subassemblies (15, 16), - a right intermediate tool (9) and a left intermediate tool (10), the upper part of the edge of the mask body (1) includes a right curve (5) and a left curve (6) that start from its center (7), curve downwards, and then rise again upwards; - the lower part (4) of the edge of the mask body (1) is horizontal; the right side (2) and the left side (3) of the mask body (1) are vertical; The right intermediate member (9) and the left intermediate member (10) are attached to the upper portion (36) of the edge of the mask body (1) and the corners (11, 12) formed between the right side portion (2) and the left side portion (3), respectively; the membrane (8) protruding from the mask body (1) has an end fixed to the mask body and an open end, and in the upper part (36) of the edge of the mask body (1), the open end of the membrane (8) extends perpendicularly from the mask body (1); As a feature, The mask body (1) is curved from the upper part (36) to the lower part (4), and at the lower part (4) of the edge of the mask body (1), the membrane (8) protrudes from the edge of the fixed mask body (1) so as to slope upward and the open end is curved downward.

6. 6. The mask according to claim 5, wherein one or more of said assembly parts (15, 16) is at least partially made of polypropylene (PP) and / or polylactic acid (PLA) and / or polyhydroxyalkanoate (PHA) and / or biopolyester.

7. A mask according to claim 5 or 6, comprising two of said assemblies (15, 16).

8. 8. A mask according to claim 7, characterized in that the two subassemblies (15, 16) are lateral.

9. 9. A mask according to any one of claims 5 to 8, wherein one or more of the assembly parts (15, 16) comprises an open base (17, 18), a lid (21, 22) having a main surface, and a side wall (23, 24) around only a portion of its periphery, preferably towards the rear of the mask, to leave one side open.

10. 10. The mask of claim 9, further comprising a filter (25, 28) interposed between the lid and the open base (17, 18).

11. 10. The mask of claim 9, further comprising a barrier interposed between the lid and the open base (17, 18).

12. 12. The mask according to claim 5, wherein at the sides (2) and (3) of the edge of the mask body (1), the open ends of the membrane (8) extend perpendicular to the mask body (1) and then curve toward the rear of the mask, with the right and left sides of the membrane (8) approaching each other while forming a curve.

13. 13. The mask according to any one of claims 5 to 12, wherein the width of the membrane increases from top to bottom at the sides of the edge of the mask body (1).

14. - the right intermediate member (9) is also fixed to the joint (13) of the lower part (4) and the right part (2) of the mask body (1) and forms a loop together with the edge of the mask body (1); A mask according to any one of claims 5 to 13, wherein the left intermediate member (10) is also fixed to the joints (14) of the lower part (4) and the left side part (3) of the mask body (1) and forms a loop together with the edge of the mask body (1).

15. 15. The mask according to any one of claims 5 to 14, wherein the right and left intermediate members (9, 10) are attached to the mask body (1) in an adjustable manner.

16. 16. A mask according to claim 9 or any one of claims 10 to 15 when dependent on claim 9, wherein each of the main surfaces (21, 22) comprises a rib (26, 27) on the side facing the base (17, 18).

17. 17. A mask according to claim 9 or any one of claims 9 to 16 when dependent on claim 9, wherein the lid comprises flanges (31, 32) at the ends of the side walls (23, 24) facing the main surfaces (21, 22).

18. 17. A mask according to claim 10 or 11, or any one of claims 11 to 16 when dependent on claim 10 or 11, wherein each filter (25, 28) or barrier includes a tab portion (29, 30).

19. 19. The mask according to any one of claims 5 to 18, wherein each of the assemblies (15, 16) is a cassette and / or each of the filters (25, 28) is a cartridge, each of the cassettes and each of the cartridges having the shape of an isosceles trapezoid with parallel sides curved concentrically.

20. 19. A mask according to claim 10, or any one of claims 11 to 18 when dependent on claim 10, wherein each filter (25, 28) has a frame (35, 36) inside which there is porous material.

21. 21. A manufacturing process for a mask according to any one of claims 5 to 20, comprising a double injection moulding, an additional injection moulding or a thermoforming step.

22. 22. A manufacturing process according to claim 21, comprising simultaneous or sequential double injection moulding of said membrane (8) and said mask body (1).

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