Microstructures for delivering a composition cutaneously to...

A - Human Necessities – 61 – M

Patent

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A61M 37/00 (2006.01)

Patent

CA 2456626

An improved method and apparatus (600) is provided as a system to deliver a composition, preferably a medical or pharmaceutical composition or active, through the stratum corneum of skin, without introducing bleeding or damage to tissue, and absent pain or other trauma. The dimensions and shapes of the microelements (12) are controlled so as to control the penetration depth into the skin. The microelements can be "hollow" such that passageways (626) are created therethrough to allow the composition to flow from a chamber (476), through the microelements, and into the skin. Alternatively, the microelements can be "solid" (622), and the composition is applied directly to the skin just before or just after the microelements are applied to the skin surface to create the openings in the stratum corneum. Another alternative embodiment uses cylindrical microstructures that are rotatably applied to the skin and which penetrate through the stratum corneum; and which can dispense fluid by various different structures.

L'invention concerne une méthode et un appareil améliorés sous la forme d'un système permettant de distribuer une composition, de préférence une composition médicale ou pharmaceutique ou une substance active, par l'intermédiaire de la couche cornée de la peau, sans saignement ou endommagement du tissu et sans douleur ou autre traumatisme. La taille et la forme des micro-éléments sont ajustées en fonction de la profondeur de pénétration souhaitée dans la peau. Les micro-éléments peuvent être creux, d'où la formation de passages traversants permettant l'écoulement de la composition dans la peau à partir d'une chambre et par l'intermédiaire des micro-éléments. Ces micro-éléments peuvent éventuellement être solides, la composition étant alors appliquée directement sur la peau juste avant ou juste après l'application des micro-éléments sur la surface de la peau, d'où la formation d'ouvertures dans la couche cornée. Dans un autre mode de réalisation, on utilise des microstructures cylindriques appliquées par rotation sur la peau, ces microstructures pénétrant dans la couche cornée et permettant la distribution d'un fluide au moyen de plusieurs structures différentes.

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