Dry powder electrostatic deposition method and apparatus

A - Human Necessities – 61 – K

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Details

A61K 9/28 (2006.01) A61J 3/00 (2006.01) A61J 3/10 (2006.01) B05B 5/025 (2006.01) B05B 5/053 (2006.01) B05B 5/08 (2006.01) B05B 5/16 (2006.01) B05C 1/06 (2006.01) B05D 1/06 (2006.01) B05D 3/14 (2006.01)

Patent

CA 2450361

A method and apparatus are presented for electrostatic deposition of dry powder onto a pharmaceutical tabkets. The apparatus includes a magnetic brush (10) with a rotatable multi-pole magnetic core (22) and a stationary outer shell (24), a developer supply (16), a printhead (160 and 162) on the outer shell and a tablet or other substrate (150). The printhead (160 and 162) includes microchannels (42) for forming a plurality of parallel lines in the channels, a corresponding plurality of transfer electrodes (46) for selectively transferring the powder from the lines to a substrate. Driver circuitry (62), power supplies (66), signal connections and a logic and control circuit (64) are also provided.

La présente invention concerne un procédé et un appareil de dépôt électrostatique de poudre sèche sur des comprimés pharmaceutiques. Cet appareil comprend une brosse magnétique (10) présentant un noyau magnétique multi-pôle rotatif (22) et une coque externe fixe (24), une alimentation en révélateur (16), une tête d'impression (160 et 162) située sur la coque externe, ainsi qu'un comprimé ou un autre substrat (150). La tête d'impression (160 et 162) comprend des microcanaux (42), qui permettent de produire plusieurs lignes parallèles dans les canaux, ainsi qu'une pluralité correspondante d'électrodes de transfert (46), qui permettent de transférer la poudre de manière sélective depuis les lignes sur un substrat. La présente invention concerne également des circuits pilotes (62), des alimentations électriques (66), des raccordements de signaux et un circuit de logique et de commande (64).

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