Pre-filter for an ostomy bag

A - Human Necessities – 61 – F

Patent

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Details

A61F 5/441 (2006.01)

Patent

CA 2612001

An ostomy bag (10) with a filter assembly having a gas filter (18) and a pre- filter (14) 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 (28) , such as ribs extending along and between two inner surface parts (24, 26) 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.

Poche de stomie (10) dotée d~un ensemble filtrant comportant un filtre à gaz (18) et un préfiltre (14) servant à empêcher ou à retarder la progression de matières solides / semi-solides et liquides jusqu~au filtre à gaz. Le préfiltre est au moins sensiblement plat et comprend un certain nombre d~obstacles (28), tels que des nervures (28) se prolongeant le long de, et entre, deux parties de surface intérieures (24, 26) d~un canal. Ces obstacles / nervures forment des passages rétrécis et élargis. Les gaz ont tendance à traverser plus rapidement les passages rétrécis alors que les matières liquides, solides et semi-liquides ont tendance à emprunter les passages élargis et à s~y accumuler. Une partie au moins des obstacles peuvent être répartis de façon aléatoire.

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