Transdermal drug delivery by electroincorporation of...

A - Human Necessities – 61 – N

Patent

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Details

IPC codes

A61N 1/30 (2006.01)

Type

Patent

Patent number

CA 2185024

Description

A method of transdermal molecular delivery comprises the steps of encapsulating molecules to be delivered into microbubbles, contacting a selected area of a tissue surface with a solution of the microbubbles, and applying a pulsed electric field of sufficient amplitude to induce dielectric breakdown of the stratum corneum and to induce transport of the molecules through the pores in the stratum corneum into the underlying tissue to enable diffusion of molecules into the tissue. In one embodiment the microbubbles are too large to pass through the pores in the SC and are fused to the surface where pores form passages from the microbubble through the SC. In another embodiment, the microbubbles are small enough to pass through the pores in the SC and pass through the pores and broken down by enzymes in the tissue.

L'invention concerne un procédé d'administration transdermique de molécules, consistant à encapsuler les molécules à administrer dans des microbulles, à mettre en contact une zone choisie de surface de tissu avec une solution de microbulles et à appliquer un champ électrique pulsé d'une amplitude suffisante pour induire une rupture diélectrique de la couche cornée de l'épiderme et le transport des molécules par les pores de la couche cornée de l'épiderme jusque dans le tissu sous-jacent, pour permettre la diffusion des molécules dans le tissu. Dans une forme d'exécution, les microbulles sont trop grandes pour traverser les pores de la CCE et elles s'accolent à la surface, où les pores forment des passages depuis la microbulle à travers la CCE. Dans une autre forme d'exécution, les microbulles sont suffisamment petites pour traverser les pores de la CCE, passer à travers les pores et être dégradées par les enzymes.

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