Device in inhalers

Details Device in inhalers Device in inhalers

A - Human Necessities

61

M

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

Patent

CA 2227547

The present invention relates to an inhalation device comprising means for breaking down aggregates of finely divided powdered medicament having a particle size less than 10 µm to provide a finely divided medicament having a large amount of particles within the respiratory range, i.e. having particle sizes less than 10 µm, said means comprise at least one pair of surfaces in a gas/air flow path, the first surface of the pair providing an inlet surface of a constriction in the gas/air flow path whereby the speed of gas/air passing along the flow path through the constriction is increased, and the second surface of the pair is situated at or near the outlet of the constriction and provides an impact surface so that in use aggregates or particles impact said surfaces, and whereby said first and second surfaces are oriented at different angles to the longitudinal direction of the flow path.

La présente invention concerne un inhalateur comprenant un dispositif servant à briser les agglomérats de médicaments en poudre finement divisée dont la grosseur de particules est inférieure à 10 µm, dans le but de fournir un médicament finement divisé comptant une grande quantité de particules se situant dans le domaine respirable, c'est-à-dire d'une grosseur inférieure à 10 µm. Ce dispositif comprend au moins deux surfaces dans un écoulement de gaz et d'air, la première donnant une surface d'entrée d'un étranglement de cet écoulement, ce qui accroît la vitesse d'écoulement dans l'étranglement, et la deuxième surface se trouvant à la sortie de l'étranglement ou près d'elle et constituant une surface de collision, de telle sorte que, à l'utilisation, les agglomérats et les particules frappent ces surfaces. Le première et la deuxième forment des angles différents avec la direction longitudinale de l'écoulement.

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