Pre-filter for an ostomy bag
AssigneeColoplast A/S
InventorBjarne Worsoee
Life of this patent
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Abstract
An ostomy bag with a filter assembly having a gas filter and a pre-filter for preventing or delaying solid/semisolid matter and liquid from reaching the gas filter. The pre-filter is at least substantially flat and comprises a number of constrictions, such as ribs extending along and between two inner surface parts of the channel. These constrictions/ribs form narrower and wider passages where the gas may more quickly pass a narrow passage and where the wider passages tend to receive and hold the liquid, solid matter and semisolid matter. At least a part of the constrictions may be provided in a random pattern.
Claims12
A pre-filter for a gas filtering assembly for an ostomy appliance, the pre-filter comprising
- a gas entrance,
- a gas exit, and
- a gas channel defined between the gas entrance and the gas exit, the gas channel having two opposed, at least substantially liquid impermeable surfaces defining there between a number of constrictions each having a predetermined, largest width, wherein the distance between the two opposed surfaces, at the constriction(s), is significantly smaller than the largest width of the constriction,
- wherein at least a part of the constrictions is provided in a random pattern.
An ostomy appliance comprising a collecting bag and a gas filtering assembly positioned in a gas path from an interior of the collecting bag to surroundings of the collecting bag,
- the gas filtering assembly comprising, in the flow direction of the gas from the interior to the surroundings, a pre-filter and a gas filter,
- wherein the pre-filter comprises
- a gas entrance,
- a gas exit, and
- a gas channel defined between the gas entrance and the gas exit, the gas channel having two opposed, at least substantially liquid impermeable surfaces defining there between a number of constrictions each having a predetermined, largest width, wherein the distance between the two opposed surfaces, at the constriction(s), is significantly smaller than the largest width of the constriction,
- wherein at least a part of the constrictions is provided in a random pattern.
Dependencies are inferred from the claim text.