Patent ID: 7344521

Claim:
An ostomy appliance comprising a front wall and a rear wall of flexible material forming a bag, the rear wall having an inlet opening into the bag by which waste material can enter the bag, at least one of the walls of the bag having at least one vent through which gas may escape from the bag so as to be a vented wall, a filter covering said vent and having a filter outlet opening, and a flap secured at only one end thereof to said vented wall adjacent said filter outlet opening, said flap being pivotally movable between a first position in which said flap is releasably sealed to the wall and covers said filter outlet opening, and a second position in which said flap, by pivoting on said one secured end, is shifted to one side so as to be non-concentric with said first position and releasably sealed to the vented wall adjacent said filter outlet opening, said flap in said second position causing said filter outlet opening to be partially or fully open.