Dry powder inhalers that inhibit agglomeration, related...

A - Human Necessities – 61 – M

Patent

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A61M 15/00 (2006.01) B01F 5/06 (2006.01)

Patent

CA 2616997

The disclosure describes methods and inhalers (50) that deagglomerate dry powder using inspiratory effort of a user of an inhaler (50). Inhaler fin (75) and mesh configurations are described that facilitate deagglomeration. At least in steady state conditions, a dry powder and airflow pattern can be generated having turbulence with flow vortices, some of which may have a vortex having an axis of rotation that extends in an inspiratory flow direction while others may have a vortex that is substantially orthogonal to the inspiratory flow direction in an inspiratory airflow path (12), as an amount of dry powder travels through the inhaler (50) to thereby deagglomerate the dry powder without trapping undue amounts of the dry powder during inhalation.

La présente invention a trait à des procédés et des inhalateurs qui assurent la désagrégation de poudre sèche à l'aide d'une force inspiratoire d'un utilisateur d'un inhalateur. L'invention a trait à des configurations d'ailettes et de mailles d'inhalateur qui facilitent la désagrégation. Au moins dans des conditions uniformes de fonctionnement, une poudre sèche et une configuration de flux d'air peuvent être générées présentant une turbulence à tourbillons de flux, dont certains peuvent avoir un tourbillon ayant un axe de rotation qui s'étend dans un direction de flux inspiratoire tandis que d'autres peuvent avoir un tourbillon qui est sensiblement orthogonal à la direction de flux inspiratoire dans un trajet de flux d'air inspiratoire, au fur et à mesure d'un déplacement d'une quantité de poudre sèche à travers l'inhalateur permettant ainsi la désagrégation de la poudre sèche sans piéger des quantités indues de poudre sèche lors de l'inhalation.

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