Dosage forms having a barrier layer to laser ablation

A - Human Necessities – 61 – K

Patent

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A61K 9/48 (2006.01)

Patent

CA 2394968

A dosage form for delivery of a therapeutic agent to a subject is described. The dosage form contains: (a) an outer wall defining an interior compartment; (b) within the interior compartment, a therapeutic agent; (c) at least one exit orifice formed by laser ablation of the outer wall for release of the agent therethrough, and (d) a barrier layer disposed between the outer wall and the interior compartment in at least a region corresponding to the exit orifice. The barrier layer comprises a material that allows the barrier layer to remain intact during laser-formation of the at least one exit orifice in the outer wall. Also disclosed is a method for controlling the depth of laser ablation of a dosage form during laser formation of an exit orifice in an outer wall of the dosage form.

L'invention concerne une forme posologique destinée à l'administration d'un agent thérapeutique à un patient. Cette forme posologique contient (a) une paroi extérieure définissant une compartiment interne ; (b) un agent thérapeutique situé dans ledit compartiment interne ; (c) au moins un orifice de sortie formé par ablation par laser sur la paroi extérieure, destiné à la libération de l'agent, et (d) une couche barrière située entre la paroi extérieure et le compartiment interne, au moins dans une région correspondant à l'orifice de sortie. Cette couche barrière est constituée d'une matière lui permettant de demeurer intacte lors de la formation par laser d'au moins un orifice de sortie dans la paroi extérieure. L'invention concerne également un procédé de commande de la profondeur de l'ablation par laser d'une forme posologique au cours de la formation, par laser, d'un orifice de sortie dans sa paroi extérieure.

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