Although plenty of methods are available to fabricate microneedles, none are able to provide feasibility to follow in the research laboratories. Any method such as solvent casting by a simple procedure is expected from the researchers.
Hi, you may have seen my other responce. The following review would provide you some more info
Nayak, A and Das, DB (2013) Potential of biodegradable microneedles as a transdermal delivery vehicle for lidocaine, Biotechnology Letters, 35(9), pp.1351-1363, DOI: 10.1007/s10529-013-1217-3.
if you have difficulty in viwing the file, please drop me an email and I will be happy to send you the paper