Powder classification device

A - Human Necessities – 61 – M

Patent

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Details

A61M 15/00 (2006.01) A61M 15/02 (2006.01)

Patent

CA 2339132

The invention discloses a method and a device for classification and, if required, electrostatic charging of a resulting separated decomposed powder preferably in the form of a substance intended for inhalation purposes. The classification takes place in that the powder is released from a device decomposing the suitable substance, whereby the powder is given a velocity perpendicular to an applied electric field (8). By adapting the strength of the electric field decomposed powder, i.e. individual particles resembling dust, will by means of the electric field (8) be attracted to a device (9) from which dosing of the individual particles then takes place. Larger particles (agglomerates) then will proceed straight ahead in an initial velocity direction as their kinetic energy is essentially larger than that for the small particles. In this manner a desirable separation of individual particles is obtained from the heavier agglomerated particles not desired to be administered and the conditions for a very good dosing of the substance thereby will result.

L'invention concerne un procédé et un dispositif de classification et éventuellement de chargement électrostatique d'une poudre décomposée séparée résultante se présentant, de préférence, sous la forme d'une substance destinée à l'inhalation. La classification est effectuée de telle façon que la poudre est déchargée d'un dispositif décomposant la substance adéquate, la poudre ayant une vitesse perpendiculaire à un champ électrique appliqué (8). En adaptant la force du champ électrique, la poudre décomposée, p.ex. les particules individuelles de type poussière, sont attirées à l'aide d'un champ électrique (8) jusqu'à un dispositif (9) qui assure le dosage des particules individuelles. Les plus grandes particules (agglomérats) poursuivent leur chemin dans une direction de vitesse initiale, leur énergie cinétique étant sensiblement supérieure à celle des petites particules. Ainsi une séparation souhaitée des particules individuelles est obtenue à partir des particules agglomérées les plus lourdes qui ne sont pas destinée à l'administration. On obtient, il s'ensuit les conditions d'un très bon dosage de la substance.

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