Patent ID: 7367965

Claim:
An ostomy appliance comprising a front wall and a rear wall of flexible material forming a bag, the rear wall having a waste opening into the bag by which waste material can enter an inner space of the bag, said bag having two or more vents through which gas may escape from the bag, each vent being covered by a separate filter device, each filter device being provided with a respective gas inlet opening in communication with the inner space of the bag and a respective filter body, and a respective outlet opening in communication with said filter body and a respective one of said vents so that in use gas flows through the filter device from the inlet opening through the filter body to the outlet opening, such gas flow being confined to said filter body, said two separate filter devices being provided in one of said walls and the respective inlet openings of said two filter devices being located at opposite sides of a vertical center line of said bag, less than three centimeters from a border of the bag and spaced from one another at an angle of at least about 45 degrees along radii of a circle of reference having a perimeter concentric with the waste opening of the bag.