Reuse determination for high level disinfectant

Publication Date

October 9, 2013

Patent Number

US6468469B2

Abstract

The present invention relates to a face mask comprising a mask body adapted to fit over at least the nose and mouth of a person to help define an interior gas space when worn, and a unidirectional valve that permits fluid communication between the interior gas space and an exterior gas space, wherein the unidirectional valve comprises a base attached to the mask body, the base comprising an opening through which gas may pass between the interior gas space and the exterior gas space, wherein the opening is surrounded by a seal surface that extends around the opening, a valve flap located over the opening, wherein the valve flap comprises a stationary portion and a movable portion, wherein a hinge is located between the stationary portion and the movable portion, wherein the valve flap comprises a closed position in which the valve flap contacts the seal surface to close the opening, and wherein the valve flap also comprises an open position in which the movable portion of the valve flap is lifted off of the seal surface such that gas may pass between the interior gas space and the exterior gas space, and further wherein the hinge comprises one or more hinge slots formed through the valve flap and one or more land portions through which the movable portion of the valve flap is connected to the stationary portion of the valve flap, wherein the one or more hinge slots are located outside of the seal surface when the valve flap is in the closed position.

Reuse determination for high level disinfectant