IT202000009958A1 - FACE MASK TO FILTER MICROBIAL LOADS AND SUSPENDED PARTICLES - Google Patents

Description

FACE MASK TO FILTER MICROBIAL LOADS AND SUSPENDED PARTICLES

DESCRIPTION

Field of application

The present invention relates to a face mask for filtering microbial charges and suspended particles, according to the preamble of the independent claim n.1.

The face mask in question finds particular application in the sector of production of personal protective equipment and surgical medical aids.

The face mask in question? advantageously intended to be worn by a user to cover their respiratory tract, i.e. nose and mouth, to prevent the user from inhaling, during the inhalation respiratory phase, microbial loads, such as for example viruses, bacteria or fungi, and particles suspended, such as for example dusts that form atmospheric particulate matter.

Alternatively or in addition, the filter mask in question prevents the user, for example in the event that he is affected by a contagious respiratory disease, from infecting other people with whom the user can come into contact, retaining microbial loads emitted by the user during the respiratory phase of exhalation.

State of the art

In the sector of production of personal protective equipment and surgical medical devices, face masks have long been known to be worn by a user to cover their respiratory tract, in order to prevent the user from inhaling microbial loads and suspended particles and/or, for example in the case in which the user himself is affected by a respiratory pathology, the emission of microbial loads which could infect other people with whom the user eventually comes into contact.

? known from Australian patent AU 2020100228 a face mask, which comprises a thinner support, provided with an external face and an internal face and intended to cover at least a part of a user's face in correspondence with the nose and mouth, and a device filter fixed to the thinned support.

The filtering device comprises a support body, which delimits two air passage channels placed across the thinned support and each extending along its own axis of development between a first opening lying on the internal face of the thinned support and a second opening lying on the outer face of the thinned support.

Inside each air passage duct ? positioned a filter arranged transversely to the development axis of the corresponding air passage channel to intercept the air flowing inside.

In particular, a filter ? designed to retain the microbial loads conveyed by the air inhaled by the user to prevent them from coming into contact with the user's respiratory tract, and the other filter ? designed to retain the microbial loads carried by the user?s exhaled air to prevent them from spreading in the environment and infecting people who may eventually come into contact with the user wearing the face mask.

The air passage channels allow the user to breathe while wearing the face mask, as they are crossed by the air inhaled by the user and, in the opposite direction, by the air exhaled by the user, while the filters placed to intercept the aforementioned channels retain the microbial loads and suspended particles transported by the air. In particular, during inspiration, the air that passes through the passage channel passes through the filter which blocks the pathogens on its surface, which therefore remain outside the respiratory tract. Known filters are generally divided into three categories, i.e. P1, P2 and P3, based on the size of the suspended particles and the microbial charges they are able to retain. The P1 and P2 category filters are able to retain only suspended particles, formed in particular by dust, and are easily crossed by microbial loads of smaller dimensions. Category P3 filters, on the other hand, are also able to retain microbial loads, as they can retain foreign bodies with dimensions even smaller than a micrometre. However, P3 category filters lose their capacity after a few hours of use. to retain the microbial loads and, therefore, must be disposed of as waste. Furthermore, the filtering device of the face mask also comprises two sources of ultraviolet light mechanically fixed to the support body, each housed in the corresponding air passage channel, facing the development axis of the corresponding air passage channel and arranged to sterilize the ?air that crosses the channel itself. However, the filtering mask of the known type briefly described up to now is revealed in practice not without drawbacks.

The main drawback lies in the fact that the filter becomes an accumulation point for the particles to be filtered and therefore it is necessary to provide for its regular cleaning or replacement so that? the protective effectiveness of the mask is not compromised over time. An additional drawback? due to the fact that the ultraviolet light sources must remain permanently on while the mask is being used to sterilize the air, thus involving the use of bulky batteries to electrically power the ultraviolet light source.

Presentation of the invention

In this situation, the problem underlying the present invention? therefore that of eliminating the problems of the known art cited above, providing a face mask, which is able to operate efficiently for long periods without the need, on the part of the user, to clean or replace the filter.

A further object of the present invention ? that of providing a face mask, which allows to minimize the impact of disposal and the waste of materials. A further object of the present invention ? that of providing a facial mask which is capable of operating with reduced energy consumption by the electrical components, in particular avoiding the use of bulky batteries. A further object of the present invention ? that of providing a face mask, which is easy and comfortable for a user to wear.

A further object of the present invention ? that of making available a face mask, which is operationally efficient and completely reliable.

Brief description of the drawings

The technical characteristics of the invention, according to the aforesaid aims, can be clearly seen from the contents of the claims set out below and the advantages of the same will become more evident in the detailed description that follows, made with reference to the attached drawings, which represent a purely by way of example and not of limitation, in which:

? figure 1 shows a front view of the face mask according to the present invention;

? figure 2 shows a side view in section of the facial mask of figure 1, obtained along the line II-II.

Detailed description of a preferred embodiment With reference to the attached figures ? Indicated as a whole by 1 is a face mask for filtering microbial loads and suspended particles according to the present invention. The face mask 1, in question, finds particular application in the industrial sector of the production of surgical medical aids and personal protective devices.

The face mask 1 in question ? in fact intended to be worn by a user to cover their respiratory tract, i.e. nose and mouth, in order to filter the air that is inhaled and/or exhaled by it, retaining microbial loads, such as viruses, bacteria, fungi or other pathogens, and suspended particles.

The face mask 1 according to the invention comprises a thinned support 2, which is equipped with an external face 3 and an internal face 4 and ? intended to cover at least part of a user's face, in particular in correspondence with the respiratory tract of the nose and mouth.

The face mask 1 also comprises at least one filtering device 5 fixed to the thinner support 2 and arranged to selectively retain the pathogens or pollutants present in the air.

Pi? in detail, the filtering device 5 comprises a support body 6, which delimits an air passage channel 7 placed across the thinned support 2 and extending along an axis of development X between at least one of its first openings 8 lying on the internal face 4 of the thinned support 2 and at least one second opening 9 lying on the external face 3 of the thinned support 2.

In particular, the thinned support 2 ? provided with a through hole in which ? the support body 6 of the filtering device 5 is arranged, possibly extending overhanging with respect to the external face 3 and/or the internal face 4 of the thinned support 2.

Conveniently, the support body 6 of the filtering device 5 is fixed to the thinner support 2, in particular along the edge of the through hole of the latter, by means of attachment per se? known, such as gluing, thermofusion, stapling, etc.

The filtering device 5 also comprises at least one filter 10 mechanically connected to the support body 6 and arranged transversely to the development axis X of the air passage channel 7 to intercept the air flowing in the air passage channel 7.

Does the filtering device 5 also comprise at least one ultraviolet light source 11 mechanically fixed to the support body 10, housed in the air passage duct 7 and directed towards the filter 10 to emit UV electromagnetic radiation (particularly UVC) on the latter.

Preferably, the ultraviolet light source 11 is designed to emit a beam of ultraviolet light having a wavelength between 100 and 300 nanometres.

The filter device 5 ? provided with power supply means 12 electrically connected to the ultraviolet light source 11 to supply the latter with the electrical energy necessary for its operation.

According to the idea underlying the present invention, the filtering device 5 further comprises heating means 13 mechanically fixed to the support body 10, electrically connected to the power supply means 12 and associated with the filter 10 to transmit heat thereto.

During use, when the face mask 1 is? worn by a user, the air that is inhaled and exhaled ? mainly forced to pass through the air passage channel 7 to be intercepted by the filter 10, which ? designed to retain pathogens or pollutants that are carried by the air itself. In particular, the filter 10 prevents microbial loads coming from the external environment and transported by the air inspired by the user from coming into direct contact with the user?s respiratory tract, or, for example in the case where the user is suffering from a contagious disease, it prevents the microbial loads expelled through the air exhaled by the user from spreading in the external environment and infecting other people.

While using the facial mask 1, the filter 10 continues to accumulate microbial charges. In order to prevent these microbial loads from affecting the ability of the filter 10 to filter the air, the latter ? subjected to a sterilization carried out by means of a synergistic action carried out by the heating means 13 and by the ultraviolet light source 11.

The heating means 13 are in fact arranged to transmit heat to the filter 10 in order to raise its temperature and the ultraviolet light source 11? arranged to emit a beam of UV rays (in particular UVC) which strikes the aforementioned filter 10 to inactivate the microbial charges present thereon. In particular, the heat transmitted by the heating means 13 to the filter 10 makes the microbial loads particularly vulnerable to the UV rays emitted by the ultraviolet light sources 11, so that these UV rays can effectively and quickly inactivate the microbial loads, sterilizing the filter 10.

Following the aforementioned sterilization, the capacity? of the filter 10 to retain further microbial loads? at least partially restored and the user can? then use the filter mask 1 without the need? to replace the filter frequently 10.

The heating means 13 are preferably arranged to release heat to the filter 10, raising its temperature in a range between 60 and 90°C. In particular, this temperature range guarantees an adequate action on the microbial loads, without requiring high energy consumption by the heating means 13 and without creating discomfort for the user.

In order to allow the inhaled or exhaled air to pass only through the air passage channel 7 and therefore prevent it from passing through any cracks formed between the user's face and the internal face 4 of the thinner support 2 without being intercepted from the filter 10, the thinned support 2 itself? preferably provided with a gasket placed to delimit the internal face 4 and intended to adhere to the user?s face.

Optionally, the face mask 1 comprises a protective covering (not shown in the accompanying figures), which is removably arranged on the inner face 4 of the thinned support 2, in particular by means of suitable hooking means, comprising for example Velcro strips. This protective coating? made for example with a sheet of transpiring material that allows the passage of air and ? placed to protect the thinned support 2 and the filtering device 5 from contact with the user's skin.

Preferably, thinned support 2 ? equipped with two ends? side 22 to which attachment means 23 are mechanically connected to keep the thin support 2 itself on the user's face.

The attachment means 23, in a wholly conventional manner, comprise two elastic laces 24, each of which extend between a first end 25 and a second end 26 and are fixed at one of the two ends. sides 22 of the thinned support 2 to define a retaining portion 27 substantially shaped like a ?U? and intended to wrap around the back portion of one of the user's two ears. Otherwise, the attachment means 23 comprise a band extending between a first end fixed at one of the two ends? sides 22 of the thinned support 2 and an opposite second end fixed to the other of the two ends? sides 22 to define a retaining portion substantially shaped like a ?U? and intended to wrap around the neck of the user.

Preferably, the thinner support 2 of the face mask 1 comprises a sheet-like body, advantageously made of a flexible material, so as to be able to easily adapt to the shape of the user's face and therefore make the face mask 1 in question comfortable to wear. Otherwise, thinned support 2 pu? also be made of a rigid or semi-rigid material, depending on the specific intended use. Conveniently, the thinner support 2 has a concave shape (pre-printed or due to deformation on the user's face) on its inner surface 4, in order to ensure optimal wearability. on the face of the user.

Advantageously, the filtering device 5 comprises a unit? logic control device 14 fixed to the support body 6, electrically connected to the power supply means 13 and capable of activating the ultraviolet light source 11 and/or the heating means 13 according to modalities? scheduled operations.

The support body 6 of the filtering device 5 ? advantageously equipped with a seat 15 in which ? the filter 10 is removably housed.

Pi? in detail, the filter 10 ? removable with respect to the seat 15 of the support body 6 so that it can be removed, disposed of as waste and replaced with a new filter 10. This replacement can? be due to the fact that, despite the sterilizing action of the heating means 13 and of the ultraviolet light source 11, the filter 10 is capable of also retaining suspended particles (such as for example dust which form atmospheric particulate matter) which, after several uses of the face mask 1 by the user, clog the filter 10. The filter 10 advantageously comprises a rigid frame 16 and a flexible septum 17 supported on the perimeter by the rigid frame 16. Pi? in detail, the rigid frame 16 ? which can be housed inside the seat 15 with the flexible septum 17 arranged transversally to the development axis X of the air passage channel 7.

In particular, the rigid frame 16 facilitates the removal or insertion of the filter 10 in the seat 15, as it allows the user to grasp the filter 10 itself firmly and to handle it.

Advantageously, the heating means 13 are mechanically fixed to the support body 6, in a position opposite to the filter 10.

Preferably, the heating means 13 comprise at least one electric resistor intended to be crossed by an electric current, which is supplied by the aforesaid supply means 12, to generate heat by means of the Joule effect and transfer it to the filter 10.

In particular, does the electric resistor comprise one or more? wires in electrically conductive material, which are substantially ?serpentine? or are arranged to form a grid, in order not to hinder the passage of air inside the air passage duct 7. Optionally, the electric resistor ? made using an electrically conductive fabric.

In accordance with the preferred embodiment illustrated in the accompanying figures, the heating means 13 have a substantially planar development on a plane of arrangement ? arranged substantially perpendicular to the development axis X of the air passage channel 7 and parallel to the flexible septum 17 of the filter 10, which is in turn arranged substantially perpendicular to the development axis X. In this way, the space occupied by the heating means 13 and by the filter 10 along the development axis X itself? particularly reduced and, consequently, the support body 6 can be provided, between the first and second opening 8, 9 of the air passage channel 7, with a limited thickness.

Conveniently, the heating means 13 are arranged to transmit the heat to the filter 10 by radiation and/or by conduction, in particular being able to be placed against the filter 10 itself in contact or not.

In accordance with a variant embodiment not shown in the attached figures, the heating means 13 comprise LED sources of infrared rays directed towards the filter 10, and arranged on the same side or on the opposite side of the latter with respect to the ultraviolet light source 11.

Advantageously, the support body 6 of the filtering device 5 comprises support means 18 protruding into the air passage channel 7 and carrying the ultraviolet light source 11 fixed in an opposite position to the filter 10.

Furthermore, the support means 18 advantageously delimit a sterilization chamber 19 with the filter 10.

Preferably, the support means 18 comprise at least one support arm 28 extending along a longitudinal axis Y, which ? substantially perpendicular to the development axis X of the air passage channel 7, between a first end? 29 connected to the support body 6 and a second end? 30 arranged in front of the filter 10, in particular in correspondence with the development axis X itself.

The ultraviolet light source 11, in a position opposite the filter 10, is preferably fixed to the support arm 28 at its second end? 30. In this way, the ultraviolet light source 11 ? positioned substantially centrally with respect to the air passage duct 7, in order to illuminate the filter 10 completely and substantially homogeneously.

In accordance with the preferred embodiment illustrated in the attached figures, the filter 10 is interposed between the heating means 13 and the ultraviolet light source 11, so that the ultraviolet light source 11 can completely illuminate one face of the flexible septum 17 without the heating means 13 covering it even partially.

Conveniently, the flexible septum 17 of the filter 10 is provided with a first face 31, facing the first opening 8 of the air passage channel 7 (arranged on the internal face 4 of the thinned support 2), and with an opposite second face 32, facing the second opening 9 of the air passage channel 7 (arranged on the external face 3 of the thinned support 2). Advantageously, the ultraviolet light source 11 is opposite to one of the two faces 31, 32 of the flexible septum 17, for example, with reference to the example of figure 2, to the second face 32, with the heating means 13 preferably arranged on the first face 31. Advantageously, the light source ultraviolet 11 ? equipped with an emission axis oriented towards the filter 10, so that the filter 10 (and in particular one of the faces 31, 32 of the flexible septum 17) is intercepted by the emission axis itself, essentially guaranteeing that most of the UV radiation emitted by the ultraviolet light source 11 strikes the filter 10 itself. For example, the emission axis of the light source 11 ? arranged aligned with the development axis X of the air passage channel.

Preferably, the ultraviolet light source 11 comprises one or more? LEDs electrically connected to the supply means 12.

In accordance with the example illustrated in figure 2, the LED of the ultraviolet light source 11 is facing frontally towards the filter 10, so that the optical axis of the LED defines the emission axis of the ultraviolet light source 11 and the UV radiation emitted by the LED directly reaches the filter 10 itself.

In accordance with a different embodiment not shown in the accompanying figures, the ultraviolet light source 11 is equipped with an optical transmission system (for example a system of reflection mirrors or an optical guide), which ? arranged to transmit the UV radiation from the LED towards the filter 10 according to a given optical path which defines, at its end, the emission axis of the ultraviolet light source 11. In this case, for example, the LED can? be arranged laterally with respect to the filter 10 (even externally to the air passage channel 7) with its optical axis which is not facing the filter 10 and ? intercepted by the optical transmission system to direct the UV radiation towards the filter 10 itself. In a conventional way, the filter 10 can? be arranged to operate in a first operative direction to filter the air inspired by the user (to protect the user), or in a second operative direction to filter the air exhaled by the user (to protect the people around the user ).

Conveniently, the filter 10 ? arranged to be positioned in the air passage channel, in a selectable manner, in one of the two aforementioned operating directions, according to the particular situations of use of the face mask 1.

Obviously, without thereby departing from the scope of protection of the present patent, the filtering device 5 (and in particular the filter 10) can? be set up to operate simultaneously in both operating directions. For example, filter device 5 can? be equipped with two air passage channels, each intercepted by the corresponding filter 10, of which one filter 10 arranged in the first operative direction and the other filter 10 arranged in the second operative direction.

Advantageously, the power supply means 12 comprise a battery 20 mounted on the support body 6 of the filtering device 5.

In this way, ? It is possible to power the heating means 13 and the ultraviolet light source 11 also during use by the user of the facial mask in question. The user can therefore wearing the face mask 1 for several hours in a row without the filter 10 losing its capacity? to retain the microbial charges, the heating means 13 and the ultraviolet light source 11 being powered by the battery 20, which ? directly integrated in the filter device 5.

Preferably, the power supply means 12 comprise a switch placed on the containment body 6 to enable and disable the electric power supplied by the battery 20 to the heating means 13 and to the ultraviolet light source 11, and advantageously to the unit? logic control 14.

In accordance with a different embodiment, the power supply means 12 comprises a battery that can be positioned in a distal position from the thinner support 2 of the face mask 1 and electrical connection means for electrically connecting the battery to the ultraviolet light source 11 and to the heating means 13. For example, the battery ? housed in an auxiliary containment body and the electrical connection means comprise a power cable placed at the junction of the aforementioned containment body and the filtering device 5. In this way, the battery used to power the heating means 13 and the source of ultraviolet light 11 pu? have larger dimensions and weight with respect to the case in which it is directly integrated in the filtering device 5 and, therefore, also have a longer duration.

Advantageously, the unit? logic control 14 comprises an electronic card 21 fixed to the support body 6 and connected to the battery 20.

Advantageously, the unit? of logic control 14 ? programmed to supply the ultraviolet light source 11 and the heating means 13 in a discontinuous manner, in particular in a cyclical manner.

In particular, the unit? of logic control 14 ? programmed to operate alternatively, preferably cyclically, between:

? a first operating state, in which the unit? logic control 14 enables the supply means 12 to supply the ultraviolet light source 11 and/or the heating means 13;

? a second operating state, in which the unit? logic control 14 disables the power supply of the ultraviolet light source 11 and of the heating means 13.

Advantageously, the operation of the ultraviolet light source 11 and/or of the heating means 13 is commanded by? unit? logic control 14 at iteration intervals which can vary substantially between 1 minute and more? tens of minutes (30 minutes or more?), depending in particular on the operational and energy specifications to be met.

Conveniently, the unit? of logic control 14 ? arranged to operate in the first operating state for a given power supply interval (for example lasting from a few fractions of seconds to a few tens of seconds), and subsequently to operate in the second operating state for a suspension interval (lasting for example from a few tens of seconds to several tens of minutes), so that, preferably, the sum of the power supply interval and the suspension interval is equal to the aforementioned iteration interval. Advantageously, the unit? control electronics 14 ? arranged to enable the ultraviolet light source 11 to irradiate the filter 10 providing a quantity? total energy per cycle substantially ranging from 20 mJ to 200 mJ.

Advantageously, the unit? of logic control 14 ? programmed to feed in sequence first the heating means 13 and then the ultraviolet light source 11.

In this way, when the ultraviolet light source 11 is powered to sterilize the filter 10 from the microbial loads it retains, the heating means 13 have already transferred heat to the filter 10 itself to raise its temperature and therefore make it more? efficient action of the ultraviolet light source 11.

In particular, with the expression ?in sequence? you will have to to understand in the following that the unit? control logic 14 can? supply the ultraviolet light source 11 both with the heating means 13 still powered and with the heating means 13 just deactivated. Advantageously, the power supply of the ultraviolet light source 11 following the disabling of the heating means 13 allows the consumption of electric energy by the filtering device 5 to be distributed over a longer time interval. extended and therefore avoid peaks in electricity consumption which mostly tend to reduce battery life 20.

For example, the unit? of logic control, in the first operating state, ? programmed to enable the power supply of the heating means 13 for a first power supply sub-interval and to enable the power supply of the ultraviolet light source 11 for a second power supply sub-interval.

In particular, the first and second supply sub-ranges are completely distinct from each other to allow the heating means 13 to operate only when the ultraviolet light source 11 is on. off, and vice versa. Otherwise, the first and second supply sub-intervals can be partially overlapped, so as to cause the heating means 13 and the ultraviolet light source 11 to operate simultaneously for a given time interval.

Obviously, without leaving the scope of protection of this patent, the unit? of logic control 14 ? programmable to enable the heating means 13 and the ultraviolet light source 11 to operate simultaneously for the entire duration of the supply interval.

Operationally, when the user puts on the face mask 1 and turns on the filtering device 5, the unit? control logic 14 feeds, in particular according to the modality? operational functions discussed above, the ultraviolet light source 11 and the heating means 13 for carrying out, in particular cyclically, the sterilization of the filter 10, so as to prevent the filter 10 from losing its capacity? to retain microbial loads.

Preferably, as discussed, the unit? of logic control 14 ? programmed to power the heating means 13 in a first predetermined power subinterval and to power the ultraviolet light source 11 for a second predetermined time subinterval.

In particular, the first time interval ? calibrated according to a standard temperature of use of the facial mask 1, so that the heating means 13, at the end of the aforementioned first supply sub-interval, have brought the filter 10 to a pre-established target temperature (advantageously between 60°C and 90?C), and the second supply subrange ? calibrated to allow the ultraviolet light source 11 to sterilize the filter 10 in an optimal manner at the target temperature.

However, if the sterilization of the filter 10 is performed at an ambient temperature which deviates from the standard temperature of use of the face mask 1, at the end of the first time interval, the heating means 13 bring the filter 10 to a temperature which in turn deviates from the target temperature, thus reducing the effectiveness of the ultraviolet light source 11 in sterilizing the filter 10.

In accordance with an optional embodiment, the filtering device 5 comprises a temperature sensor 33, which ? functionally associated with the filter 10 to detect temperature measurements associated with the latter, and ? electrically connected to the unit? electronic control 14 to send to the latter measurement signals indicative of the temperature of the filter 10 itself. For example, the temperature sensor 33 ? mechanically fixed to the support body 6, ? housed in the air passage channel 7, preferably in the sterilization chamber 19 near the of filter 10, ? electrically connected to the unit? electronic control 14 and ? arranged to measure the temperature inside the air passage duct 7 and send corresponding measurement signals to the unit? electronic control 14. The latter ? programmed to power the heating means 13 according to the measurement signals received from the temperature sensor 33, in particular to disable the heating means 13 when the predetermined target temperature is reached. This embodiment, in particular, makes it possible to ensure that the filter 10 is brought to the target temperature even if the face mask 1 is used at different temperatures which differ significantly from the ambient temperature.

The found what? conceived therefore achieves the set goals.

Claims (13)

1. Face mask (1) to filter microbial loads and suspended particles, which includes: ? a thinner support (2) provided with an external face (3) and an internal face (4), intended to cover at least a part of a user's face in particular in correspondence with the respiratory tracts of the nose and mouth; ? at least one filtering device (5) fixed to the thinned support (2) and comprising: ? a support body (6), which delimits an air passage channel (7) placed across said thinner support (2) and extends along an axis of development (X) between at least one of its first openings (8) lying on the internal face (4) of said thinned support (2) and at least one second opening (9) lying on the external face (3) of said thinned support (2); ? at least one filter (10) mechanically connected to said support body (6), which ? arranged transversely to the development axis (X) of said air passage channel (7) to intercept the air flowing in said air passage channel (7); ? at least one ultraviolet light source (11) mechanically fixed to said support body (10), housed in said air passage channel (7) and directed towards said filter (10); ? power supply means (12) electrically connected to said ultraviolet light source (11) for powering said ultraviolet light source (11); said facial mask (1) being characterized in that said filtering device (5) also comprises heating means (13) mechanically fixed to said support body (10), electrically connected to said power supply means (12) and associated with said filter (10) to transmit heat thereto. 2. Facial mask (1) for filtering microbial charges and suspended particles, according to claim 1, characterized in that said filtering device (5) comprises a unit? logic control device (14) fixed to said support body (6), electrically connected to said power supply means (13) and capable of activating said ultraviolet light source (11) and/or said heating means (13) according to methods ? scheduled operations. 3. Facial mask (1) for filtering microbial loads and suspended particles, according to claim 1 or 2, characterized in that the support body (6) of said filtering device (5) is ? equipped with a seat (15) in which ? removably housed said filter (10). 4. Facial mask (1) for filtering microbial loads and suspended particles, according to claim 3, characterized in that said filter (10) comprises a rigid frame (16) and a flexible septum (17) supported perimetrically by said rigid frame ( 16); said rigid frame (16) being housed inside said seat (15) with said flexible septum (17) arranged transversally to the development axis (X) of said air passage channel (7). 5. Facial mask (1) for filtering microbial charges and suspended particles, according to any one of the preceding claims, characterized in that heating means (13) are mechanically fixed to said support body (6), in a position opposite to said filter (10). 6. Facial mask (1) for filtering microbial charges and suspended particles, according to any one of the preceding claims, characterized in that the support body (6) of said filtering device (5) comprises support means (18) projecting within said air passage channel (7) and carrying said ultraviolet light source (11) fixed in a position opposite to said filter (10). 7. Facial mask (1) for filtering microbial charges and suspended particles, according to claim 6, characterized in that said support means (18) delimit a sterilization chamber (19) with said filter (10). 8. Facial mask (1) for filtering microbial charges and suspended particles, according to any one of the preceding claims, characterized in that said supply means (12) comprise a battery (20) mounted on the support body (6) of said device filter (5). 9. Facial mask (1) for filtering microbial loads and suspended particles, according to claims 2 and 8, characterized in that said unit? logic control system (14) comprises an electronic board (21) fixed to said support body (6) and connected to said battery (20). 10. Facial mask (1) for filtering microbial loads and suspended particles, according to any one of the preceding claims, characterized in that said supply means (12) comprise a battery that can be positioned in a distal position from the thinner support (2) of said mask facial 1 and electrical connection means for electrically connecting said battery to said ultraviolet light source (11) and to said heating means (13). 11. Facial mask (1) for filtering microbial charges and suspended particles, according to claim 2, characterized in that said unit? logic control (14) ? programmed to feed said ultraviolet light source (11) and said heating means (13) in a discontinuous manner. 12. Facial mask (1) for filtering microbial loads and suspended particles, according to claim 2, characterized in that said unit? logic control (14) ? programmed to feed in sequence first said heating means (13) and then said ultraviolet light source (11). 13. Facial mask (1) for filtering microbial charges and suspended particles, according to claim 2, characterized in that said filtering device (5) comprises at least one temperature sensor (33), which ? functionally associated with said filter (10), ? electrically connected to this unit? of logic control (14), and ? arranged to detect temperature measurements associated with said filter (10) and send corresponding measurement signals to said unit? of logical control (14), which ? programmed to power said heating means (13) as a function of said measurement signals.