Patent ID: 7914813

Claim:
An interface for a transdermal drug administration device having a flat plate formed from polylactic acid comprising a plurality of two-dimensionally arranged conical or pyramidal projections capable of piercing the skin and a plurality of openings spaced from the conical or pyramidal projections and capable of delivering a drug, said openings being respectively arranged in correspondence with the projections, wherein the distance between a particular projection and its corresponding opening is smaller than the distance between the particular projection and an opening that does not correspond thereto, wherein channels are provided on the surface of the flat plate between the openings and their corresponding projections for directing a drug from the openings to their corresponding projections, said projections being 100 to 700 μm in height, lower bases of the projections being 30 to 200 μm in diameter, said openings being 50 to 2000 μm in diameter, and the ratio between the number of the openings and the number of the projections being 1:1 to 1:2.