Microstructured filter

Details Microstructured filter Microstructured filter

B - Operations, Transporting

01

D

B01D 29/03 (2006.01) A61M 15/00 (2006.01) B01D 39/16 (2006.01) B01D 39/20 (2006.01) B01D 46/12 (2006.01) B01D 67/00 (2006.01) B01D 71/02 (2006.01)

Patent

CA 2300908

A microstructured filter for a fluid, the filter having an inlet for unfiltered fluid and an outlet for filtered fluid, the filter comprising: a plurality of projections (7) which are arranged in at least two rows (3) in mutually juxtaposed relationship and which project out of a base plate (1) and which are an integral component of the base plate, a plurality of passages (8) between the projections (7), and a cover plate which is securable to the base plate to cover the projections (7) and the passages (8), wherein in the passages form a plurality of through paths from the inlet to the outlet, said inlet comprises an elongate inlet slot (5) for the unfiltered fluid, which extends over approximately the entire filter width and which is approximately as high as the projections (7) projecting out of the base plate, on the inlet side of the filter, and said outlet comprises an elongate outlet slot for the filtered fluid, which extends over approximately the entire filter width and which is approximately as high as the projections (7) projecting out of the base plate, on the outlet side of the filter. The filter according to the invention remains operational, even if a part of the filter area is obstructed. The filter is used for example in an atomiser with which an aerosol is produced from a fluid which contains a medicament.

L'invention concerne un filtre à microstructure pour liquide, qui présente un orifice d'entrée de liquide non filtré et un orifice de sortie de liquide filtré. Le filtre comprend au moins deux rangées (3) de projections (7) juxtaposées les unes relativement aux autres et faisant saillie sur une plaque support (1) dont elles sont partie intégrante, une série de passages (8) entre les projections (7), et une plaque de recouvrement qui se fixe sur la plaque support pour recouvrir les projections (7) et les passages. Lesdits passages forment une série de chemins traversants reliant l'orifice d'entrée à l'orifice de sortie. L'orifice d'entrée comprend une fente allongée d'admission (5) de liquide non filtré qui s'étend sur pratiquement toute la largeur du filtre et présente approximativement la même hauteur que les projections (7) faisant saillie sur la plaque support sur le côté d'admission du filtre. L'orifice de sortie comprend une fente allongée de sortie (5) de liquide filtré qui s'étend sur pratiquement toute la largeur du filtre et présente approximativement la même hauteur que les projections (7) faisant saillie sur la plaque support sur le côté de sortie du filtre. Le filtre de l'invention demeure fonctionnel, même lorsqu'une de ses parties est obstruée. Il s'utilise, par exemple, dans un atomiseur associé à un aérosol obtenu à partir d'un liquide contenant un médicament.

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