Method and apparatus for iontophoretic drug delivery

A - Human Necessities – 61 – N

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326/15

A61N 1/30 (2006.01) A61N 1/32 (2006.01)

Patent

CA 2002849

An iontophoretic device for delivery of a drug comprising a flexible, non-conductive backing; first and second conductive electrodes composed of a substantially non-ionizing material in a plane, one side of the plane which is optionally attached to the optionally flexible backing, and the other side of the plane which is adapted to be affixed to one side of a flexible and electrically conductive layer containing the drug to be delivered; a source of electrical current and means for reversing the polarity of the two electrodes. The device can additionally include the conductive layer containing the drug to be delivered, affixed to the plane of the two electrodes. An ion exchange membrane can optionally be disposed between the two electrodes and the drug-containing layer. The device can optionally contain pulsing means or current varing means or both to vary the amount of current delivered from time to time or in absolute amount.

Cette invention concerne un dispositif d'iontophorèse pour l'introduction d'un médicament dans l'organisme, qui comprend une membrane support souple non conductrice; une première et une seconde électrodes planes et conductrices composées sensiblement d'un matériau non ionisant pouvant être fixé à la membrane support facultative par une des faces, l'autre face étant adaptée pour être fixée à l'une des faces d'une couche souple et conductrice d'électricité renfermant le médicament à administrer; une source de courant électrique et un moyen d'inversion de la polarité des électrodes. La couche conductrice renfermant le médicament peut en outre être fixée à la surface plane des électrodes. Une membrane échangeuse d'ions peut être disposée entre les deux électrodes et la couche médicamenteuse. Le dispositif peut également comporter un moyen de variation du courant ou un moyen pulseur, ou les deux, afin de varier, de façon intermittente ou d'une valeur absolue, la quantité de courant.

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