Respirator that includes an integral filter element, an...

A - Human Necessities – 62 – B

Patent

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A62B 23/02 (2006.01)

Patent

CA 2421180

A negative pressure respirator (20') that has an integrally-disposed filter element (28) and that covers at least the nose and mouth of a wearer. The respirator (20') includes an exhalation valve (22) and an impactor element (50) that covers the exhalation valve (22). The exhalation valve (22) has a diaphragm and an orifice and opens in response to increased pressure when the wearer exhales to allow exhaled air to be rapidly purged from the mask interior. The impactor element (50) is positioned in the exhale flow stream to remove particles and other contaminants from the exhaled air. The exhalation valve and impactor element have a ratio of Zn:Dj of less than about 5. The respirator (20') is beneficial because it provides comfort to the wearer by allowing warm, moist, high-CO2-content air to be rapidly-evacuated from the mask interior through the valve (22) and also protects the wearer from splash- fluids and from polluted air while at the same time protecting other persons or items from being exposed to particles and other contaminants exhaled by the wearer.

L'invention concerne un respirateur (20') à pression négative qui comporte un élément (28) filtrant incorporé et recouvre au moins le nez et la bouche de l'utilisateur. Le respirateur (20') comprend une soupape (22) d'expiration et un élément d'impacteur (50) qui recouvre la soupape d'expiration (22). La soupape d'expiration (22) comporte un diaphragme et un orifice, et s'ouvre en réponse à une augmentation de pression produite lorsque l'utilisateur expire afin de purger rapidement l'air expiré de l'intérieur du masque. L'élément d'impacteur (50) est placé dans le flux d'expiration pour éliminer les particules et autres contaminants de l'air expiré. La soupape d'expiration et l'élément d'impacteur présentent un rapport of Z¿n?:D¿j? inférieur à environ 5. Le respirateur (20') est bénéfique par le confort qu'il confère à l'utilisateur en évacuant rapidement la chaleur, l'humidité, l'air à forte teneur en CO¿2? de l'intérieur du masque par la soupape (22), et aussi parce qu'il protège l'utilisateur d'éclaboussures et de l'air pollué tout en protégeant d'autres personnes ou articles contre l'exposition à des particules et à d'autres contaminants expirés par l'utilisateur.

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