Transdermal delivery device for delivering a biologically active agent having a hydrophobic and hydrophilic coating

摘要

An apparatus and method are provided for selectively applying an agent-containing liquid coating to extremely tiny skin piercing microprojections. The coating solution is applied to the skin piercing microprojections using a coating technique which selectively coats only predetermined portions the skin piercing microprojections. By the use of various photoresists and hydrophobic coatings, a defined and precise portion of the microprojections and/or the microprojection arrays can be coated with an agent formulation.