Powder feeding device

A - Human Necessities – 61 – M

Patent

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Details

A61M 15/00 (2006.01) A61M 15/02 (2006.01) B05B 5/16 (2006.01) B05B 7/14 (2006.01)

Patent

CA 2338722

The invention discloses a method and a device for de-agglomeration and electrostatic charging of a fine powder preferably intended for inhalation purposes. The electrostatic charging takes place by means of tribo, corona and/or inductive charging. The device according to the invention is particularly intended for being able to dose decomposed powder directly into the inspiration air for administering of, for instance, active pharmaceutical substances, alternatively provide a further dosing device (9) with electrostatically charged de-agglomerated powder for an even more controlled dosing of the substance into the inspiration air. De-agglomeration preferably takes place in that two rotating brushes (2, 3) containing powder are touching each other. The bristles are rub against each other and thereby decompose the powder agglomerates. The rotation speed of the brushes is suitably optimized to achieve the best possible result for different powder substances. The design of the brushes is further optimized for the substances, which are to be de-agglomerated and electrostatically charged prior to an administering step.

L'invention concerne un procédé et un dispositif de désagglomération et de chargement électrostatique d'une fine poudre, de préférence, destinée à l'inhalation. Le chargement électrostatique s'effectue par un chargement tribo, corona et/ou inductif. Le dispositif selon l'invention est plus particulièrement destiné à permettre le dosage de la poudre décomposée directement dans l'air d'inspiration pour l'administration, par exemple, de substances pharmaceutiques actives, ou bien il constitue un autre dispositif de dosage (9) contenant de la poudre désagglomérée chargée électrostatiquement et destiné à un dosage davantage contrôlé de la substance dans l'air d'inspiration. La désagglomération est, de préférence, effectuée par le contact de deux brosses (2, 3) pivotantes. Les poils se frottent les uns aux autres, décomposant ainsi les agglomérats de poudre. La vitesse de rotation des brosses est convenablement optimisée pour accomplir le meilleur résultat possible pour les différentes substances. La conception des brosses est davantage optimisée pour les substances qui doivent être désagglomérées et électrostatiquement chargées avant l'opération d'administration.

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