WO2022121263A1 - Masque filtrant à lanières réglables - Google Patents

Masque filtrant à lanières réglables Download PDF

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Publication number
WO2022121263A1
WO2022121263A1 PCT/CN2021/099388 CN2021099388W WO2022121263A1 WO 2022121263 A1 WO2022121263 A1 WO 2022121263A1 CN 2021099388 W CN2021099388 W CN 2021099388W WO 2022121263 A1 WO2022121263 A1 WO 2022121263A1
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WO
WIPO (PCT)
Prior art keywords
respirator
mask body
strap
straps
wearer
Prior art date
Application number
PCT/CN2021/099388
Other languages
English (en)
Inventor
Ching LAM
Original Assignee
The Hong Kong Polytechnic University
Vannex International Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Hong Kong Polytechnic University, Vannex International Limited filed Critical The Hong Kong Polytechnic University
Priority to CN202180082083.1A priority Critical patent/CN116761525A/zh
Publication of WO2022121263A1 publication Critical patent/WO2022121263A1/fr

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    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1161—Means for fastening to the user's head
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1107—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
    • A41D13/113—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a vertical fold or weld

Definitions

  • the present disclosure generally relates to a respirator or a face mask. More particularly, the present disclosure relates to a respirator with adjustable straps that can achieve tight-fitting on most wearers.
  • Airborne transmission is generally a disease transmission of various viral diseases through the air.
  • An individual may be inflected by exposing to infectious agent, such as virus-containing respiratory droplets, dusts, and particles.
  • infectious agent such as virus-containing respiratory droplets, dusts, and particles.
  • the disease can be transmitted through the air over time and distance , like sneezing that aerosolizing the droplet to nano-sized particle.
  • the recent outbreak of the novel coronavirus COVID-19 is a good example of droplet and occasionally airborne transmission.
  • COVID-19 can be aerosolized from droplet to airborne and then attached to fine particles, suspended dust particles, or other respiratory droplets of an infected person.
  • respirators and masks have been designed to be used for protecting wearer from airborne transmission. The respirators remove particulate material and infectious agents from the air before it is inhaled by the wearer, thereby the wearer can be protected. The protection can also be extended to the neighboring persons as any infectious agents are also removed from the air exhaled by the wearer.
  • the present technology generally adopts non-adjustable head harness and earloop design (not recommended design by the Centers for Disease Control and Prevention) for respirators, particularly for half-mask respirators like N95, N99, FFP2, and FFP3.
  • respirators particularly for half-mask respirators like N95, N99, FFP2, and FFP3.
  • the healthcare worker needs to perform quantitative fit testing prior to the use. Normally, they are required to don a respirator in clinical setting for 2 to 4 hours before changing to another new respirator.
  • the non-adjustable band of the conventional respirator may not achieve the adequate tightness which may increase the risk of leakage and infection. Besides, if there is too tight, the respirator (when donning for a period of time, like 2 hours) may contribute to pressure sore at nose, ear or head, which leads to contact infectious risk.
  • Mask Usability Scale MUS that reflects tolerated heat, breathability, tightness, interference on speaking, skin itchiness, mask displacement, discomfort on ear lobe, duration for use, interference on working efficiency, mist over glasses and overall level of comfort, is good to indicate the performance of donned respirator for working.
  • WO2020/053786 A2 discloses a respirator including adjustable strap covering various types of face-piece respirators.
  • the respirator is provided with straps threading through a number of apertures to retain the strap in position, which may be adjustable.
  • the aperture includes gripping portion, such as teeth, engaging the strap to prevent the strap from being pulled back.
  • PFE particulate filtering efficiency
  • fit testing of respirator are tested using 0.3 micron, the openings of the respirator body may give rise to further air leakage, compromising the filtering ability.
  • the disclosure in this PCT publication also provides the use of left and right attachments with one or more slits on linear weld to form an aperture, which the straps can be connected externally without any opening on the body of the respirator.
  • the slits created on the attachments may reduce the air leakage, but with such design the strap is not adjustable.
  • Other approaches of using extra patches attached to the respirator body increase the material cost and the complexity in mass production.
  • respirator with adjustable straps that can achieve tight-fitting on most wearers.
  • the respirator comprises a mask body, an upper strap, and a lower strap.
  • the mask body is adapted to fit over a mouth and a nose of a wearer.
  • the upper and lower straps are both detachably attached to the mask body by threading through at least one upper anchor structure and one lower anchor structure respectively.
  • Each of the upper strap and the lower strap comprises markings for indicating at least one upper position on the upper strap and at least one lower position on the lower strap.
  • the upper position defines a first length of the upper strap and the lower position defines a second length of the lower strap that the respirator fits to the wearer with increased consistency when the upper and lower straps are pulled against the upper and lower anchor structures and stretched over the wearer’s head.
  • the mask body comprises a breathable zone
  • the upper and lower anchor structures are provided on perimeter regions of the mask body outside the breathable zone.
  • the perimeter regions comprise one or more attachments.
  • the upper and lower anchor structures are selected from the group consisting of staples, clips, pins, fasteners, and other attachment means.
  • the upper and lower anchor structures and the mask body are formed integrally.
  • the upper and lower straps are made of polyisoprene for providing a tension force to keep the respirator in position without slipping off.
  • the upper and lower straps are made of rubbers selected from the group consisting of natural Gutta-percha and synthesized trans-1, 4-polyisoprenes; natural rubber and synthesized cis-1, 4-polyisoprene; poly-cis-isoprene; and other polymers and petroleum-based monomers.
  • the upper and lower straps are attachable to a front side of the mask body.
  • each of the upper and lower straps has a first end welded to the mask body and a second end adjustably attachable to the mask body.
  • the upper strap has a first end adjustably attachable to the mask body through a first upper anchor structure, and a second end adjustably attachable to the mask body through a second upper anchor structure.
  • the lower strap has a third end adjustably attachable to the mask body through a first lower anchor structure, and a fourth end adjustably attachable to the mask body through a second lower anchor structure.
  • the markings comprise left markings provided on the first end and the third end, and right markings provided on the second end and the fourth end.
  • the markings are evenly spaced across a longitudinal length of the upper and lower straps for providing visual indications of the upper position and the lower position.
  • the markings are scribed, printed, engraved, stamped, or embossed on the upper and lower straps.
  • FIG. 1 illustrates a front perspective view of a respirator in accordance with certain embodiments of the present disclosure, being donned by a person;
  • FIG. 2 is a front view of the respirator in a first configuration in accordance with certain embodiments of the present disclosure, when the respirator is flat-folded;
  • FIG. 3 is a front view of the respirator of FIG. 2, when the straps are stretched;
  • FIG. 4 is a conceptual diagram illustrating the cross-sectional side view of the respirator of FIG. 2;
  • FIG. 5 is a rear view of the respirator of FIG. 2, when the respirator is fully opened;
  • FIG. 6 is a front view of the respirator in a second configuration in accordance with certain embodiments of the present disclosure, when the respirator is flat-folded;
  • FIG. 7 is a front view of the respirator in a third configuration in accordance with certain embodiments of the present disclosure, when the respirator is flat-folded;
  • FIG. 8 is a rear view of the respirator of FIG. 7, when the respirator is fully opened;
  • FIGS. 9A-9F illustrate the steps for donning the respirator of FIG. 2 in accordance with certain embodiments of the present disclosure
  • FIG. 10 is a graph showing the face area distribution in Chinese healthcare workers obtained from a survey in Hong Kong;
  • FIG. 11 is a table showing the fit test passing rate of the respirator comparing with the conventional 3-panel model respirator and cup-shaped model respirator;
  • FIG. 12 is a table showing the usability (20-minute donning) of the respirator comparing with the conventional N95 respirator.
  • FIG. 13 is a table showing the usability (2-3 hours donning) of the respirator comparing with the conventional N95 respirator with earloop design.
  • the present disclosure generally relates to a respirator, particularly for non-reusable half-mask respirators like N95, N99, FFP2, and FFP3. It is apparent to one skilled in the art that the term respirator may include other reusable respirators and full facepiece respirators. More specifically, but without limitation, the present disclosure relates to a respirator with adjustable straps that can achieve tight-fitting on most wearers. The adjustable strap in the respirator is cheap yet without compromising the filtration performance, and the design does not require extra patches and allows consistency in performance. This invention particularly offers a low-cost improvement applicable to those non-reusable half-mask respirators, and in certain embodiments, it may also be applied to other reusable respirators as a low-cost improvement.
  • breathable zone refers to a zone or a region of the respirator that permits a transport of air from the ambient atmospheric gas space to the interior gas space between a mask body and a wearer’s face, and vice versa.
  • layer in a filtering structure refers to a layer of air-permeable material on a respirator, which is adapted for the primary purpose of removing contaminants from an air stream that passes through it.
  • flat-folded is used to describe a respirator that is folded flat for storage.
  • inhalation refers to the inhalation, for example, but without limitation, of air by the wearer and includes both oral and nasal inhalations.
  • exhalation refers to the exhalation, for example, but without limitation, of air by the wearer and includes both oral and nasal exhalations.
  • mask body refers to an air-permeable structure that is designed to fit over the nose and mouth of a wearer defining the interior gas space separated from the ambient atmospheric gas space.
  • peripheral means the outer periphery of the mask body away from the breakable zone, which would be disposed generally proximate a wearer’s face when the respirator is being donned by a wearer.
  • respirator 100 being donned by a person in accordance with certain embodiments of the present disclosure.
  • the respirator 100 is an air filtration device that is worn by a person to provide the wearer with clean air to breathe.
  • the respirator 100 is a non-reusable respirator for clinical use in a high level of protection against any aerosol generation procedure.
  • the feature of the respirator 100 is to increase the passing rate of quantitative fit testing for wearers with diverse facial anthropometry and head sizes. It is apparent that the teaching of the present disclosure may also be applied to face masks or other protective masks.
  • the respirator 100 of the present disclosure is implemented on a half-face respirator, such as N95, N99, FFP2, and FFP3.
  • the respirator 100 comprises a mask body 110, an upper strap 210, and a lower strap 220.
  • the mask body 110 is a central portion of the respirator 100 adapted to fit over the mouth and the nose of the wearer.
  • the upper strap 210 and the lower strap 220 are attachable to the lengthwise of the mask body 110 from the front side of the mask body 110.
  • the mask body 110 includes a filtering structure disposed on the breathable zone. Therefore, the mask body 110 can remove at least a portion of contaminants, respiratory droplets, dusts, or other particles when the air from the ambient atmospheric gas space enters the interior gas space between a mask body 110 and a wearer’s face through the filtering structure. During inhalation, the air passes through at least a portion of the filtering structure before entering the wearer’s respiratory system. During exhalation, the air released by the wearer passes through the filtering structure to the ambient atmospheric gas space.
  • the first configuration of the respirator 100 when it is flat-folded, is illustrated in FIG. 2.
  • the mask body 110 is in a 3-panel configuration with a substantially rectangular in shape in flat-folded configuration, and the fully opened configuration is shown in FIG. 4.
  • On the front side of the respirator 100 there is provided an upper strap 210 and a lower strap 220.
  • the upper and lower straps 210, 220 are adjustable head harnesses or head straps arranged on the front side so that when the two straps are stretched over the wearer’s head, the pulling strength on the straps can keep the mask body 110 in place.
  • the upper strap 210 is adjustably attachable to the mask body 110 by threading through a first upper anchor structure 231 and a second upper anchor structure 233.
  • the lower strap 220 is adjustably attachable to the mask body 110 by threading through a first lower anchor structure 232 and a second lower anchor structure 234.
  • the upper and lower anchor structures 231-234 are selected from the group consisting of staples, clips, pins, fasteners, and other attachment means.
  • the upper and lower anchor structures 231-234 have a length larger than the width of the upper and lower straps 210, 220.
  • the anchor structures 231-234 are staples made of stainless steel.
  • the staples are characterized with Brinell scale ⁇ 187HB, rockwell hardness of ⁇ 90HRB, and/or Vickers hardness of ⁇ 200HV.
  • the staple length is between 8mm to 15mm, while the strap has a width of 5mm to 13mm.
  • the upper and lower anchor structures 231-234 and the mask body 110 are formed integrally.
  • the upper strap 210 has a first end 210A adjustably attachable to the mask body 110 through the first upper anchor structure 231, and a second end 210B adjustably attachable to the mask body 110 through the second upper anchor structure 233.
  • the lower strap 220 has a third end 220A adjustably attachable to the mask body 110 through a first lower anchor structure 232, and a fourth end 220B adjustably attachable to the mask body 110 through a second lower anchor structure 234.
  • the upper and lower anchor structures 231-234 are provided on perimeter regions of the mask body outside the breathable zone.
  • the perimeter regions comprise one or more attachments 120. Therefore, if the upper and lower anchor structures 231-234 are staples penetrating through the attachments 120, there is no increased risk of leakage or infection. The air from the ambient atmospheric gas space cannot may not enter the interior gas space of the respirator 100 through the upper and lower anchor structures 231-234.
  • Each of the upper strap 210 and the lower strap 220 comprises markings 240 for indicating at least one upper position on the upper strap 210 and at least one lower position on the lower strap 220.
  • the upper position defines a first length of the upper strap 210 and the lower position defines a second length of the lower strap 220 that the respirator 100 fits to the wearer with increased consistency (after adjusted to the optimal lengths that are determined by quantitative fit test) when the upper and lower straps 210, 220 are pulled against the upper and lower anchor structures 231-234 and stretched over the wearer’s head.
  • markings 240 on the entire width of the upper and lower straps 210, 220.
  • the markings 240 are evenly spaced across a longitudinal length of the upper and lower straps 210, 220 for providing visual indications of the upper position and the lower position.
  • the markings 240 are scribed, printed, engraved, stamped, or embossed on the upper and lower straps 210, 220. It is apparent that the markings 240 may also be segmented into left markings and right markings without departing from the scope and spirit of the present disclosure. In such case, the left markings are respectively provided on the first end 210A and the third end 220A, while the right markings are respectively provided on the second end 210B and the fourth end 220B.
  • the present invention provides a respirator 100 that can achieve tight-fitting on most wearers. This can be achieved by the use of the upper and lower straps 210, 220, which are adjustably attachable to the mask body 100, and the markings 240 thereon.
  • the upper and lower straps 210, 220 are made of polyisoprene, which is a kind of synthetic rubber, for providing a tension force to keep the respirator in position without slipping off. Therefore, the tight-fitting performance can be very consistent and the risk of slipping off is minimal.
  • the upper and lower straps 210, 220 may also be made of other material selected from the group consisting (1) Polyethylene terephthalate (PET) +Spandex; (2) Nylon + Spandex; and (3) Latex (natural rubber) .
  • PET Polyethylene terephthalate
  • Nylon + Spandex Nylon + Spandex
  • Latex Natural rubber
  • the preferred embodiment of the present disclosure uses polyisoprene to make the upper and lower straps 210, 220.
  • the length of the upper and lower straps 210, 220 can be extended to a length equivalent to 5 times of the original length. With a higher flexibility, the upper and lower straps 210, 220 are more flexible and easier for wearer to achieve tight-fit. In some cases, a relatively shorter strap may be used so that it can fit for most wearers with different head size. Furthermore, the surface of the polyisoprene is easier to stick to human hair. Therefore, the upper and lower straps 210, 220 are not easily drop off or slippery during intensive movements.
  • SBR styrene-butadiene rubbers
  • Other synthetic rubbers include (1) polyisoprene, prepared by polymerization of synthetic isoprene; (2) chloroprene, prepared by polymerization of 2-chlorobutadiene; and (3) nitrile rubber made from cyanobutadiene or 2-propenenitrile and butadiene.
  • FIG. 4 shows a conceptual diagram illustrating the cross-sectional side view of the respirator 100.
  • the mask body 110 includes a filtering structure comprises an exterior layer 111 of spunbond polypropylene fabric, a first middle layer 112 of meltblown polypropylene filter layer, a second middle layer 113 of meltblown polypropylene filter layer, and an interior layer 114 of spunbond polypropylene fabric.
  • a nose foam and a chin foam 252 may also be provided for increasing the comfort of the wearer.
  • the upper and lower straps 210, 220 are provided, which is already discussed above.
  • the mask body 110 may also comprise electrically-charged microfibers or nanofibers.
  • the mask body 110 may comprise one or more breathing valves.
  • FIG. 5 illustrates a rear view of the respirator 100 when the respirator 100 is fully opened by pulling the top panel 115A and the bottom panel 115B at the rear side.
  • the interior gas space inside the mask body 110 is expanded when the respirator 100 is fully opened.
  • the staples are applied by a stapler from front to back, such that the staples can prevent the upper and lower straps 210, 220 from slipping out.
  • the respirator 100A comprises a mask body 110, an upper strap 210, and a lower strap 220.
  • the mask body 110 is a central portion of the respirator 100A adapted to fit over the mouth and the nose of the wearer.
  • the upper strap 210 and the lower strap 220 are attachable to the mask body 110 from the front side of the mask body 110.
  • the upper and lower straps 210, 220 are adjustable head harnesses or head straps arranged on the front side so that when the two straps are stretched over the wearer’s head.
  • the upper strap 210 is adjustably attachable to the mask body 110 by threading through an upper anchor structure 231A
  • the lower strap 220 is adjustably attachable to the mask body 110 by threading through a lower anchor structure 232A.
  • the upper strap 210 has a first end welded to the mask body 110 at an upper joint 241, and a second end adjustably attachable to the mask body 110.
  • the lower strap 220 also has a first end welded to the mask body 110 at a lower joint 242, and a second end adjustably attachable to the mask body 110.
  • the connection to the mask body 110 may use other suitable techniques, such as adhering, knotting, mechanically fastening, etc.
  • FIGS. 7-8 which is generally designated as 100B.
  • the respirator 100B is in a cup-shaped configuration during use and folded flat for storage.
  • the mask body 110 is vertically folded along a centerline 116 of the mask body 110, and so the respirator 100B is usually referred to as a vertical flat-fold respirator.
  • the mask body 110 of the respirator 100B in a cup-shaped configuration has a breathable zone in the middle, and perimeter regions along the periphery of the mask body 110.
  • the perimeter regions are not in the breathable zone, and the perimeter regions are fit onto the wearer’s face during inhalation and exhalation.
  • the upper and lower anchor structures 231-234 are provided on the perimeter regions of the respirator 100B. Unlike the first and second configurations of the respirator 100, there is no attachments 120. However, the risk of air leakage is small as long as the upper and lower anchor structures 231-234 are not within the breathable zone.
  • FIGS. 9A-9F illustrate the steps for donning the respirator 100 in accordance with certain embodiments of the present disclosure.
  • the wearer needs to perform quantitative fit testing to identify the first length of the upper strap 210 and the second length of the lower strap 220 prior to the use.
  • the first and second lengths are defined by the upper position and the lower position of the markings 240.
  • the wearer adjusts the first and second lengths by moving the upper and lower straps 210, 220 to align the upper and lower anchor structures 231-234 to the markings 240 at which the respirator 100 fits to the wearer’s head.
  • the second step is to pull open the top panel 115A and the bottom panel 115B of the respirator 100, and bend the nose wire 251 at the center.
  • the wearer puts the respirator 100 on by covering the mouth and nose, and stretches the lower strap 220 and upper strap 210 over the head, as demonstrated in FIGS. 9C-9D.
  • the lower strap 220 is stretched to position around the neck and below the ears, and the upper strap 210 is stretched to position at the top of the head.
  • the wearer should also adjust the respirator 100 to a comfortable position by pulling the top panel 115A towards the bridge of the nose, and the bottom panel 115B under the chin.
  • the wearer can place the fingertips of both hands at the top of the nose wire 251 to apply force thereto, as illustrated in FIG. 9E.
  • the force can mold the nose wire 251 to the shape of the wearer’s nose by moving the fingertips down both sides along the nose wire 251.
  • the wearer can test for any air leakage at the respirator perimeters regions by performing sharp exhalations and inhalations. If air is leaked, the wearer should re-adjust the nose wire 251 or stretch the upper and lower straps 210, 220 again.
  • the fit testing results of the respirator 100 of the first configuration and the respirator 100B of the third configuration were carried out in the Centre for Infection Control in Hong Kong.
  • the facial anthropometries measurement of 354 healthcare workers were obtained for determining the face area, which is shown in the distribution graph in FIG. 10.
  • the mean face area is found to be 150.22 cm 2 , with a standard deviation of 16.54 cm 2 .
  • the healthcare workers are separated into three groups, namely (1) small face size; (2) medium face size; and (3) large face size.
  • FIG. 11 is a table showing the fit test passing rate of the respirator 100 comparing with a conventional 3-panel model respirator (or known as “horizontal fold-flat respirator” ) , and the fit test passing rate of the respirator 100B comparing with a conventional cup-shaped model respirator (or known as “vertical fold-flat respirator” ) .
  • the fit test passing rate are significantly higher than the conventional models.
  • the passing rate of the respirator 100B in cup-shaped configuration has generally very high (80.6%-94.1%) across the healthcare workers of all face sizes.
  • the respirators 100, 100B of the present disclosure have better fit rate than that of other conventional respirators, particularly for individuals with a small and medium face size. This demonstrates the improvements on the fit test results after employing the embodiments of the present disclosure.
  • further testing on second group of Chinese healthcare workers was performed using the respirator 100, 100B of the present disclosure.
  • the upper and lower strap 210, 220 are adjusted to the optimal lengths most suitable for the user using the markings 240 to improve the fit test results. Affirmative results of 87.5%and 88.5%were obtained, which endorses the positive impact achieved by the present disclosure.
  • FIGS. 12-13 Another aspect of assessing the performance of the respirator 100 is on the usability. This is a subjective analysis and a user survey was conducted. The results are summarized in FIGS. 12-13.
  • the usability of the respirator 100 is comparable with the some N95 with earloop with clips design in a 20-minute usage. However, for donning of 2-3 hours, which is a normal working pattern, the shortcomings of earloop with clips design significantly demonstrated on item 1.3 (feeling tightness) , item 1.7 (discomfort on ear lobe) , item 1.8 (can use in long duration) , item 1.9 (lowering my working efficiency) , and item 1.11 (overall comfort) . Therefore, the respirator 100 of the present disclosure out-performs the counterpart in usability.
  • the respirator 100 of the present disclosure offers a low-cost improvement to the conventional face masks that can significantly improve the passing rate of the quantitative fit testing for wearers with diverse facial anthropometry and head sizes.
  • the respirator 100 is designed for achieving the standard for clinical use, with a high level of protection against any aerosol transmissions.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

L'invention concerne un masque filtrant (100, 100A, 100B) à lanières réglables (210, 220) qui permettent de bien ajuster le masque filtrant sur la plupart des utilisateurs. Le masque filtrant (100, 100A, 100B) comprend un corps de masque (110), une lanière supérieure (210) et une lanière inférieure (220). Le corps de masque (110) est conçu pour venir recouvrir la bouche et le nez d'un utilisateur. Les lanières supérieure et inférieure (210, 220) sont toutes deux fixées de manière amovible au corps de masque (110) par insertion respectivement à travers au moins une structure d'ancrage supérieure (231, 231A, 233) et au moins une structure d'ancrage inférieure (232, 232A, 234). Chaque lanière parmi les lanières supérieure (210) et inférieure (220) comprend des repères (240) pour indiquer au moins une position supérieure sur la lanière supérieure (210) et au moins une position inférieure sur la lanière inférieure (220). La position supérieure définit une première longueur de la lanière supérieure (210) et la position inférieure définit une deuxième longueur de la lanière inférieure (220), de sorte que le masque filtrant (100, 100A, 100B) s'ajuste plus étroitement sur le visage de l'utilisateur lorsque les lanières supérieure et inférieure (210, 220) sont tendues par-dessus la tête de l'utilisateur.
PCT/CN2021/099388 2020-12-11 2021-06-10 Masque filtrant à lanières réglables WO2022121263A1 (fr)

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CN202180082083.1A CN116761525A (zh) 2020-12-11 2021-06-10 具有可调整绑带的呼吸器

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HK32020021992.3 2020-12-11

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