JP2024039633A - Nasal pressure balancing device for underwater mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nasal pressure balancing device for an underwater mask.

SOLUTION: A nasal pressure balancing device for an underwater mask includes two pockets. Each pocket has an opening and a bottom area corresponding to the opening. Each bottom area is pre-formed to have a first shape with multiple continuous bending sections and is located in a first position away from the nose wings of a user. Each bottom area is stretched and transformed into a second shape, and can exist in a second position close to the opposing nasal wings of the user when each of user's two fingers applies force to a bottom area toward the inside from the openings of the two pockets. Each bottom area restores automatically or returns to the first position under the outward pressing force and can return to the first shape when the applied force is released.

SELECTED DRAWING: Figure 1A

COPYRIGHT: (C)2024,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a nasal pressure balancing device, and more particularly to a nasal pressure balancing device for an underwater mask.

Underwater activities (eg snorkeling) are one of the popular modern leisure activities. When engaging in underwater activities, users usually wear a mask to facilitate movement underwater and enjoy the underwater scenery.

In order to balance the pressure inside and outside the user's ear, and also to balance the pressure inside and outside the mask, it is usually necessary to perform the Frenzel Equalization or Valsalva Maneuver. However, if pressure balancing is to be performed underwater, the mask should be designed with a soft nasal pressure balancing mechanism, and should be placed sufficiently close to the user's nose when worn, and then the mask should be placed close enough to the user's nose to be able to reach the user through the nasal pressure balancing mechanism. It cannot be performed unless you pinch your nose with your fingers (usually your thumb and index/middle finger) to ensure the nostrils are closed. In this case, optimally, the closer the position of pinching the nose with the fingers to the base of the nasal wings, the better. By doing this, it becomes possible to easily and reliably pinch the nose and close the nostrils.

Unfortunately, the current mainstream full-face snorkel masks (FFSM) on the market clearly have difficulty providing a useful nasal pressure balancing mechanism in their basic structure. Moreover, FFSM mainly uses a large rigid lens module as its basic structure to cover the user's eyes, nose and mouth. The unique design of the FFSM is that the lens module projects a certain distance in front of the user's face. Therefore, if the nasal pressure balancing mechanism is added, the position of the nasal pressure balancing mechanism will further protrude forward by a certain distance. As can be imagined, when wearing the FFSM, the user's face is pressed against the waterproof sealing skirt at the rear of the frame. Therefore, even if a nasal pressure balancing mechanism is added, the distance between the nose and the pressure balancing mechanism will inevitably be very large. As a result, it becomes difficult to even reliably touch the nose with the user's fingers through the pressure balancing mechanism, let alone perform a pressure balancing operation that closes the entire nostril (at most, the user can only reach the tip of the nose). This is the reason why FFSMs currently have almost no pressure balancing function. Some people in the industry tried to do this, but due to the lack of strength of the nasal pressure equalization device, it could not withstand the pressure underwater and collapsed, causing discomfort from friction on the face and unexpected pressure. All attempts ended in failure, resulting in the patient's nose being pinched.

In view of the above, how to solve the above problems has become a consensus goal in the industry.

It is an object of the present invention to provide a nasal pressure balancing device for an underwater mask. The nasal pressure balancing device of the present invention has two pockets. When the mold is opened, a continuous bend (i.e., a reversely bent or curved shape) is preformed in the bottom area of each pocket, so that the bottom area of the pocket is stretched and deformed by applying an inward force to the bottom area. Let them do it. This makes it possible to extend the depth of the pocket by a certain distance toward the user's face, bringing it closer to the wings of the nose. Therefore, if it is necessary to perform a pressure balancing operation on the nose, the user can extend two fingers into the two pockets and push the bottom areas of the two pockets inward. The depth of the pocket is increased and extends toward the base of the user's nasal alar. This allows the user's fingers to easily cover the entire outside of the nostrils, ensuring a reliable nose pinching action. When the pressure balancing operation of the nose is completed, the user simply relaxes and pulls back the fingers, and the two pockets are opened by utilizing the soft and elastic properties of the material and the structural characteristics of the continuous bending part. , automatically returning outward to its original unstretched (i.e., preformed) shape and position. This eliminates the discomfort caused by inappropriate contact to the user. From the above, the present invention can realize the addition of a nasal pressure balancing mechanism to an underwater mask. Moreover, the design of the nasal pressure balancing device of the present invention can be applied to any type of underwater mask, and can reliably achieve the pressure balancing preparation operation of pinching the nose and closing the nostrils.

To achieve the above object, the present invention discloses a nasal pressure balancing device for an underwater mask. The nasal pressure equalization device includes two pockets each having an opening and a bottom area corresponding to the opening. Each said bottom region is pre-shaped into a first shape having a plurality of continuous bends and is at a first location remote from the user's nasal alar. When two fingers of the user respectively apply force to the bottom regions inwardly from the openings of the two pockets, each of the bottom regions is stretched and deformed into a second shape; In addition, it is possible to exist in a second position close to the nasal wings facing the user. Further, when the applied force is released, each of the bottom regions may automatically restore itself or return to the first position under an outward pushing force and return to the first shape.

In one example, the nasal pressure balancing device further includes a frame and a septum. The septum portion extends between the upper and lower portions of the frame, thereby forming the two left and right pockets that are independent of each other.

In one example, the frame and the septum are integrally molded with a frame portion or a lens portion of the underwater mask.

In one example, the two pockets are integrally molded with the waterproof sealing skirt of the underwater mask.

In one example, the frame, the septum, and the two pockets are integrally molded with a waterproof sealing skirt of the underwater mask.

In one example, the two pockets are made of soft material. The soft material has a Shore A hardness of 10 to 90 and is selected from silicone rubber, thermoplastic rubber, thermoplastic polyurethane, polyvinyl chloride, or combinations thereof.

In one example, the soft material has a Shore A hardness of 70 to 90.

In one example, the continuous bend has at least two adjacent side walls that are parallel to each other or have an included angle of less than 90 degrees.

In one example, the thickness of each successive bend is between 0.3 millimeters (mm) and 4 millimeters (mm).

In one example, the height of each successive bend is between 2 millimeters (mm) and 18 millimeters (mm).

In one example, the underwater mask is a snorkel mask. The snorkel mask has a main body and a mouthpiece-type snorkel that is separated from the main body. The nasal pressure balancing device is installed in a nasal chamber defined by at least one of the frame part, the lens part, and the waterproof sealing skirt of the main body.

In one example, the underwater mask is a breathing mask. The breathing mask has a snorkel, a main body, and a three-way connector. The body covers the user's eyes and nose. The snorkel and the three-way connector are provided at an upper portion and a lower portion of the main body, respectively, and allow fluid to pass between the snorkel and the three-way connector.

In one example, the three-way connector includes a nose communication section, a drain valve section, and a mouthpiece section that communicate with each other. The nasal pressure balancing device is provided in a nasal chamber defined in the main body. Further, the three-way connector allows fluid to pass between the main body and the nasal passage through the nasal communication part and the nasal chamber.

In one example, the underwater mask is a full-face breathing mask. The full-face breathing mask has a body and a snorkel communicating with the body. The body covers the user's eyes, nose and mouth. Further, the nasal pressure balancing device is installed in an oronasal chamber defined in the main body.

FIG. 1A is a front view of a nasal pressure balancing device for an underwater mask in one embodiment of the present invention. FIG. 1B is a rear view of FIG. 1A. FIG. 1C is a cross-sectional view of FIG. 1A showing a plurality of continuous bends in the bottom regions of the two pockets preformed in the nasal pressure equalization device. FIG. 2A is a schematic perspective view of the nasal pressure balancing device of the present invention attached to a mask. FIG. 2B is a cross-sectional view of FIG. 2A, showing the relationship between the mask of FIG. 2A and the user's face. FIG. 2C is another cross-sectional view of FIG. 2A, showing the user's fingers exerting an inward force on the nasal pressure equalization device. FIG. 2D is another cross-sectional view of FIG. 2A showing the nasal pressure equalizer returning to its original position when the user relaxes the finger. FIG. 3A is a schematic cross-sectional view of a continuous bend embodiment of the nasal pressure balancing device of the present invention. FIG. 3B is a schematic cross-sectional view of a different embodiment of a continuous bend in the nasal pressure balancing device of the present invention. FIG. 3C is a schematic cross-sectional view of a different embodiment of a continuous bend in the nasal pressure balancing device of the present invention. FIG. 3D is a schematic cross-sectional view of a different embodiment of a continuous bend in the nasal pressure equalization device of the present invention. FIG. 3E is a schematic cross-sectional view of a different embodiment of a continuous bend in the nasal pressure equalization device of the present invention. FIG. 4A is a schematic front perspective view of one embodiment of the invention, showing the nasal pressure equalization device attached to a snorkel mask. FIG. 4B is a schematic rear perspective view of one embodiment of the present invention, showing the nasal pressure equalization device attached to a snorkel mask. FIG. 5A is a schematic front perspective view of another embodiment of the invention showing a nasal pressure equalization device attached to a breathing mask having a three-way connector. FIG. 5B is a schematic rear perspective view of another embodiment of the invention showing a nasal pressure equalization device attached to a breathing mask having a three-way connector. FIG. 6A is a schematic front perspective view of a further embodiment of the invention, showing the nasal pressure equalization device attached to a full-face breathing mask. FIG. 6B is a schematic rear perspective view of a further embodiment of the invention, showing the nasal pressure equalization device attached to a full-face breathing mask.

The content of the present invention will be explained below through Examples, but the Examples of the present invention do not imply that the present invention can be practiced only in any specific environment, application, or special form described in the Examples. It is not a restriction. Accordingly, the description of the embodiments is for the purpose of illustrating the invention only and is not intended to limit the invention. It should be noted that in the following embodiments and drawings, members not directly related to the present invention are omitted and are not shown. Further, the size relationship between each member in the drawings is only for ease of understanding, and is not intended to limit the actual ratio.

One embodiment of the invention is shown in FIGS. 1A-1C and 2A-2D. Figures 1A and 1B show a front and rear view, respectively, of a nasal pressure balancing device 1 of the present invention. FIG. 1C is a cross-sectional view of FIG. 1A. 2A to 2D are schematic diagrams of different stages in the use of the nasal pressure balancing device 1 of the present invention.

The nasal pressure balancing device 1 can be applied to any type of underwater mask M0 (for example, a snorkel mask, a respirator, a respirator with a three-way connector, or a full-face respirator (these are discussed further below).

The nasal pressure equalization device 1 includes two pockets P1, P2. Each pocket P1, P2 has an opening 11 and a bottom region 12 corresponding to the opening 11. Pockets P1 and P2 may be made of soft material. For example, the soft material may have a Shore A hardness of 10 to 90 and include silicone rubber, thermoplastic rubber (TPR) (e.g., thermoplastic elastomer, TPE) , thermoplastic polyurethane (TPU), polyvinylchloride (PVC), or a combination thereof.

Each bottom region 12 is preformed to form a first shape S1 having a plurality of continuous bends 121 (e.g., preformed by injection molding to form a reversely bent or curved shape). ). As shown in FIGS. 2A and 2B, the bottom region 12 exists at a first position FP away from the nasal alar NW of the user UR when it is not receiving force. When the bottom region 12 is in the first position FP, it cannot substantially contact the face of the user UR, and thus does not cause discomfort due to rubbing of the face.

When the user UR wants to perform a pressure balancing operation, as shown in FIG. 2C, the user UR deeply inserts two fingers into the openings 11 of the two pockets P1 and P2, and pushes the bottom areas 12 toward the inside. Just add force to it. By applying an inward force with the fingers, the bottom region 12 can be stretched and deformed into the second shape S2 (ie, the continuous bends 121 mentioned above widen). At this time, the bottom region 12 is located at a second position SP close to the nasal wings NW facing the user UR. When the bottom region 12 is in the second position SP, the finger of the user UR allows the bottom region 12 to cover the entire outside of the nostril. As a result, the operation of pinching the nose becomes reliable, and pressure balancing operation is performed.

When the user UR releases the force, as shown in FIG. 2D, each bottom region 12 may automatically restore itself or may receive an outward pressure to return to the first position FP and return to the first shape S1. Ideally, the bottom region 12 automatically returns to the first shape S1 and can return to the first position FP. However, in actual use, if the bottom region 12 cannot achieve the automatic return function due to environmental variables (too much water pressure or elastic fatigue of the pockets P1 and P2 due to long-term use), the user may press the underwater mask M0 toward the face. At this time, the stretched pockets P1 and P2 collide or come into contact with the areas of the user's face near the sides of the nose and cheekbones, generating an outward reaction force that assists the bottom region 12 in returning to the first position FP.

The nasal pressure balancing device 1 may include a frame 1R and a septum 1P. The septal part 1P forms two mutually independent left and right pockets P1 and P2 by spanning between the upper part 1RU and the lower part 1RL of the frame 1R. The frame 1R and the septum 1P may be made of a hard material so as to serve as supporting members. Further, the entire nasal pressure balancing device 1 (frame 1R, septum 1P, and two pockets P1, P2) may be fabricated selectively using a soft material having a Shore A hardness of 70 to 90. This provides a considerable amount of supporting force, thereby avoiding the situation of the building collapsing due to underwater pressure.

As can be understood, the frame 1R and the septum 1P can be made using a hard material, so in reality, the frame 1R and the septum 1P are integrally molded with the frame or lens part of the underwater mask M0. You may. In addition, since the pockets P1 and P2 can be made of a soft material, in practice, the pockets P1 and P2 may be integrally molded with the waterproof sealing skirt of the underwater mask M0 (for example, they may be integrally molded with a silicone rubber material). ). Also, of course, due to the thickness of the soft material and the Shore A hardness design, it is actually possible to mold the frame 1R, septum 1P, and pockets P1 and P2 integrally with the waterproof sealing skirt of the underwater mask M0. good.

Further, in one embodiment, the thickness T1 of each continuous bent portion 121 is such that it stretches and deforms into the second shape S2 by applying a light force, and returns to the first shape S1 after the force is released. It may be between 0.3 millimeters (mm) and 4 millimeters (mm) to achieve the purpose. Further, in one embodiment, the height H1 of each successive bent portion 121 may be between 2 millimeters (mm) and 18 millimeters (mm). The height H1 can be designed accordingly based on the difference in the user's face shape so that the purpose of covering the entire outside of the nostril when the bottom region 12 is in the second position SP is achieved. It is.

The continuous bending portion 121 in the nasal pressure balancing device 1 of the present invention may have a plurality of modes. At least two adjacent side walls SW may be formed in these continuous bent portions 121. In FIG. 3A, two adjacent side walls SW of these continuous bent portions 121a are parallel to each other. Further, in FIG. 3B, two adjacent side walls SW of these continuous bent portions 121b have an included angle A1 of less than 90 degrees.

Further, the number of continuous bent portions 121 described above belongs to the design parameters and does not limit the present invention. For example, FIG. 3C illustrates a case where a large number of continuous bent portions 121c are provided. On the other hand, FIG. 3D illustrates a case where a small number of continuous bent portions 121d are provided. In addition, in one embodiment, as shown in FIG. 3E, these continuous bent portions 121e are formed in the bottom region 12 and continue to a position close to the septal portion 1P. In other words, the number and position of the continuous bends 121 can be adjusted based on the actual application (e.g., targeting users of various ages, genders, and face shapes), and these changes may occur over time. Also falls within the scope of protection of the present invention.

In this embodiment, the nasal pressure balancing device 1 is a module in which a frame 1R, a septum 1P, and pockets P1 and P2 are integrally molded. However, in other embodiments, the frame 1R, the septum 1P, and the pockets P1, P2 can be separated from each other and are formed by assembling them together. In this case, since the pockets P1 and P2 are replaceable, it is possible to provide pockets P1 and P2 in different configurations as shown in FIGS. 3A to 3E. In this way, comfort during use is increased by adapting the device to users with different face shapes through interchangeability.

Further, the entire external shape of the nasal pressure balancing device 1 (particularly the frame 1R and the septum 1P) may be changed depending on the type of underwater mask. In other words, any shape modified based on the concept of the present invention (for example, the nasal bag defined by the waterproof sealing skirt of the underwater mask is used as the septal part 1P of the nasal pressure balancing device 1) is not limited. , it is sufficient that two pockets P1, P2 can be defined in the nasal pressure equalization device 1, and that the bottom region 12 of each pocket P1, P2 is pre-shaped to have a plurality of continuous bends 121. Therefore, no matter how the overall external shape of the nasal pressure balancing device 1 is changed, any changes are within the scope of the present invention. Further, the two pockets described above are merely for explaining the number of insertions of the user's two fingers. However, this number should not be limited; for example, any equivalent solution, such as considering two pockets communicating with each other as one pocket space, is a viable solution.

FIGS. 4A and 4B show another embodiment of the present invention, and illustrate a schematic diagram when the nasal pressure balancing device 1 of the present invention is applied to a snorkel mask M1. The snorkel mask M1 includes a main body M11 and a mouthpiece-type snorkel (not shown) that is separated from the main body M11. The main body M11 includes a frame portion F1, a lens portion L1 (which may include one lens or two separate lenses), and a waterproof sealing skirt W1. In FIGS. 4A and 4B, the nasal pressure balancing device 1 is entirely formed integrally with a waterproof sealing skirt W1, and is provided in a nasal chamber N1 defined by the waterproof sealing skirt W1. In addition, in this embodiment, the nasal bag defined by the waterproof sealing skirt W1 also serves as the septal part 1P of the nasal pressure balancing device 1. However, in other embodiments, the nasal pressure balancing device 1 may be provided in the nasal chamber defined by the frame part or the lens part of the body of the snorkel mask.

5A and 5B show another embodiment of the invention, illustrating the case where the nasal pressure balancing device 1 of the invention is applied to a breathing mask M2. The mask M2 that allows breathing has a main body M21, a snorkel M23, and a three-way connector M25. The main body M21 covers the user's eyes and nose. The main body M21 may include a frame part F2, a lens part L2, and a waterproof sealing skirt W2. The snorkel M23 and the three-way connector M25 are provided at the upper UP and lower LP of the main body M21, respectively, and allow fluid to pass between them and the inside of the main body M21.

The three-way connector M25 may have, for example, a nose communication portion NP, a drain valve portion DP, and a mouthpiece portion MP that communicate with each other. In this embodiment, the nasal pressure balancing device 1 is provided in the nasal chamber N2 defined by the main body M21 (for example, the waterproof sealing skirt W2). Moreover, the three-way connector M25 allows fluid to pass between it and the main body M21 through the nasal communication part NP and the nasal chamber N2.

6A and 6B show another embodiment of the present invention, in which the nasal pressure balancing device 1 of the present invention is applied to a mask M3 that allows full-face breathing. . The mask M3 that enables full-face breathing includes a main body M31 and a snorkel M33 that communicates with the main body M31. The main body M31 covers the user's eyes, nose, and mouth. The main body M31 may include a frame part F3, a lens part L3, and a waterproof sealing skirt W3. The nasal pressure balancing device 1 is entirely formed integrally with the waterproof sealing skirt W3, and is provided in the mouth-nasal chamber N3 defined by the main body M31 (for example, the waterproof sealing skirt W3).

As stated above, the nasal pressure balancing device of the present invention is applicable to any type of underwater mask. If it is necessary to perform a nasal pressure balancing operation, the user extends two fingers into the two pockets of the nasal pressure balancing device and applies force to spread the successive bends. You can perform the action of pinching your nose by simply holding your nose. Then, by simply relaxing and pulling back the user's fingers, these pockets automatically or manually return outward to their original shape and position. Therefore, according to the nasal pressure balancing device of the present invention, underwater pressure balancing operation becomes easy and executable. The opening 11 defined by each pocket P1, P2 is therefore provided for allowing the user's fingers to pass through and contact and press against the bottom area 12 for deformation. Note that, during the operation, it does not matter whether the finger touches the bottom region 12 and then passes through the opening 11, or whether the finger touches the bottom region 12 after passing through the opening 11. In other words, before the pockets P1 and P2 are deformed by the force, it is difficult to determine whether the bottom regions 12 of the pockets P1 and P2 protrude outside the opening 11 and are aligned with the opening 11, or whether they are deep inside the opening 11. , all belong to possible designs.

The above embodiments are only for illustrating the embodiments of the present invention and detailing the technical features of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications or equivalent adjustments that can be easily accomplished by a person skilled in the art are within the scope of the invention. Therefore, the scope of protection of the rights of the present invention should be based on the claims.

1 Nasal pressure balance device 11 Opening 12 Bottom region 121 Continuous bent portion 121a Continuous bent portion 121b Continuous bent portion 121c Continuous bent portion 121d Continuous bent portion 121e Continuous bent portion P1 Pocket P2 Pocket 1R Frame 1RL Lower part 1RU Upper part 1P Septum S1 First shape S2 Second shape T1 Thickness H1 Height A1 Enclosing angle SW Side wall M0 Underwater mask UR User NW Wings of nose FP 1st position SP 2nd position M1 Snorkel mask M11 Main body F1 Frame part L1 Lens part W1 Waterproof sealed skirt N1 Nasal chamber M2 Mask that allows breathing M21 Main body M23 Snorkel M25 Three-way connector F2 Frame part L2 Lens part W2 Waterproof sealed skirt N2 Nasal chamber NP Nasal communication part DP Drain valve part MP Mouthpiece part M3 Full face type M31 Main body M33 Snorkel F3 Frame part L3 Lens part W3 Waterproof sealed skirt N3 Mouth and nose chamber UP upper part LP lower part

Claims (14)

A nasal pressure equalization device for an underwater mask, comprising two pockets each having an opening and a bottom area corresponding to the opening, the device comprising:
each said bottom region is pre-shaped to have a first shape having a plurality of continuous bends and is in a first position remote from the nasal alar of the user;
When two fingers of the user respectively apply force to the bottom regions inwardly from the openings of the two pockets, each of the bottom regions is stretched and deformed into a second shape; and can exist in a second position close to the nasal wings facing the user,
When the applied force is released, each of the bottom regions is capable of automatically restoring or returning to the first position under an outward pushing force and returning to the first shape. A device that does this. The nasal pressure control device according to claim 1, further comprising a frame and a septum, and the septum extends between an upper and a lower part of the frame to form the two left and right pockets that are independent of each other. Balance device. The nasal pressure balancing device according to claim 2, wherein the frame and the septum are integrally molded with a frame portion or a lens portion of the underwater mask. The nasal pressure balancing device according to claim 2, wherein the two pockets are integrally molded with the waterproof sealing skirt of the underwater mask. The nasal pressure balancing device according to claim 2, wherein the frame, the septum and the two pockets are integrally molded with a waterproof sealing skirt of the underwater mask. The two pockets are made of a soft material having a Shore A hardness of 10 to 90 and selected from silicone rubber, thermoplastic rubber, thermoplastic polyurethane, polyvinyl chloride, or a combination thereof. The nasal pressure balancing device according to claim 1. 7. The nasal pressure balancing device of claim 6, wherein the soft material has a Shore A hardness of 70-90. 2. The nasal pressure equalization device of claim 1, wherein the continuous bend is formed with at least two adjacent side walls that are parallel to each other or have an included angle of less than 90 degrees. 2. The nasal pressure balancing device of claim 1, wherein the thickness of each successive bend is between 0.3 millimeters (mm) and 4 millimeters (mm). 2. The nasal pressure balancing device of claim 1, wherein the height of each successive bend is between 2 millimeters (mm) and 18 millimeters (mm). The underwater mask is a snorkel mask, and the snorkel mask has a main body and a mouthpiece-type snorkel that is separated from the main body, and the nasal pressure balancing device includes a frame part of the main body, a lens 2. The nasal pressure equalization device of claim 1, wherein the nasal pressure balancing device is provided in a nasal cavity defined by at least one of the following: and a watertight sealing skirt. The underwater mask is a mask that allows breathing, and the breathing mask has a snorkel, a main body, and a three-way connector, the main body covers the eyes and nose of the user, and the snorkel and the three-way connector. The nasal pressure balancing device according to claim 1, wherein connectors are provided at the upper and lower portions of the main body, respectively, to allow fluid to pass between the connectors and the interior of the main body. The three-way connector has a nasal communication section, a drain valve section, and a mouthpiece section that communicate with each other, the nasal pressure balancing device is provided in a nasal chamber defined in the main body, and the three-way connector has a nose communication section, a drain valve section, and a mouthpiece section that communicate with each other; 13. The nasal pressure balancing device according to claim 12, wherein fluid is passed between the main body and the nasal passage through the nasal passage and the nasal chamber. The underwater mask is a mask that allows full-face breathing, and the mask that allows full-face breathing has a main body and a snorkel communicating with the main body, and the main body is a mask that allows full-face breathing. 2. The nasal pressure balancing device according to claim 1, which covers the nose and mouth, and wherein the nasal pressure balancing device is provided in an oronasal chamber defined in the main body.