The invention relates to a micro-needle array
chip, a transdermal delivery device, a transdermal delivery patch and a preparation method thereof, wherein a micro-needle is obliquely fixed on a substrate at a set angle, the upper surface of the needle is an elliptic
plane parallel to the substrate or obliquely provided with an
acute angle, the needle is further treated to have more edge angles, a
metal wire bar or tube penetrates a non-metallic material substrate such as
polymer and the like along a certain angle, and then a nick of the
metal wire bar or tube on the substrate is grinded and polished; and photosensitive
resist patterns are formed nearby the nick at one end by adopting photoetching and
etching technology, then the
metal wire bar or tube is subjected to chemical or
electrochemical corrosion to form a needle point and the photosensitive
resist is removed, the surface of the manufactured
solid micro-needle array
chip can be covered with drugs, and the manufactured
solid micro-needle array
chip can deliver liquid
medicine or extract
body fluid. The method avoids the
skin plugging a transfusion hole, is easy to adjust and control the maximum penetrating depth of the micro-needle, and is suitable for
percutaneous transportation of biological macromolecular drugs and
cosmetics and skincare and new
percutaneous preparation of the prior drugs.