Dry powder inhaler with an inhalation-activated piston

Details Dry powder inhaler with an inhalation-activated piston Dry powder inhaler with an inhalation-activated piston

A - Human Necessities

61

M

A61M 15/00 (2006.01) B05B 11/00 (2006.01) B05B 11/06 (2006.01)

Patent

CA 2157583

A dry powder inhalator (20) for delivering a precise dose of a medicament contains a mesh disc (10) impregnated with a series of spaced, medicament doses (16) about the disc periphery. The inhalator (20) is armed by manually retracting a finger-pull (54) extending downwardly from the bottom of the inhalator housing or rotating the bottom of the housing. The user inserts a mouthpiece (32) on the housing into the mouth and inhales. This causes a chamber (68) in the housing under a diaphragm (92) to evacuate, thereby pulling the diaphragm (92) down onto a knock out lever (96). The pivoting of the lever (96) enables release of a piston (62) into a cylinder (68) which first compresses, and then dispenses a reduced volume of air at high pressure in a burst up through the medicament disc (10). When the burst of air hits the impregnated disc (10), the dose (16) is forced out of the mesh's interstices, producing a cloud of the drug in its powdered form, which is inhaled by the user.

Un inhalateur (20) de poudre sèche destiné à administrer une dose précise d'un médicament contient un disque d'engrenage (10) imprégné d'une série de doses (16) de médicament espacées sur la périphérie du disque. On arme manuellement l'inhalateur (20) en rétractant un doigt de tirage (54) s'étendant vers le bas à partir de la partie inférieure du logement de l'inhalateur, ou en faisant tourner la partie inférieure du logement. L'utilisateur place un embout (32) situé sur le logement dans sa bouche et inhale. Ceci provoque l'évacuation d'une chambre (68) se trouvant dans le logement sous une membrane (92), abaissant ainsi la membrane (92) sur un levier de déclenchement (96). Le pivotement du levier (96) permet la libération d'un piston (62) dans un cyclindre (68) qui tout d'abord comprime et ensuite distribue un volume d'air réduit sous haute pression en une salve à travers le disque (10) de médicament. Lorsque la salve d'air heurte le disque imprégné (10), la dose (16) est expulsée des interstices de l'engrenage, produisant une pluie du médicament sous sa forme pulvérulente, laquelle est inhalée par l'utilisateur.

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