Patent ID: 7627938

Claim:
A method of making a hollow microneedle array comprising the steps of: depositing a first SU-8 layer on a top side of a substrate; exposing a bottom side of the substrate to a first UV emission, wherein the UV emission passes through the substrate into the first SU-8 layer to form a first exposed SU-8 area; applying a second SU-8 layer of to the first exposed SU-8 area; applying one or more masks to the bottom side of the substrate; exposing the bottom side of the substrate to a second UV emission, wherein the second UV emission passes through the one or more masks, the substrate and the first exposed SU-8 area to form one or more pins in the second SU-8 layer; remove one or more unexposed areas of the second SU-8 layer; depositing one or more coating layers on the one or more pins and the first SU-8 layer-to form one or more coated pins; removing a portion of the one or more coated pins; and separating the one or more coated pins from the one or more pins in the second SU-8 layer to form the hollow microneedle array.