Soluble microneedles(MNs) has recently become an efficient and minimally invasive tool in transdermal drug delivery because of their excellent biocompatibility and rapid dissolution.However,direct monitoring of the release of drug in vivo is a difficult task.The dissolution of MNs was monitored to estimate the delivery of drug by using optical coherence tomography(OCT); The performances of two soluble MN arrays made from polyvinyl alcohol(PVA) and polyvinyl alcohol/polyvinylpyrrolidone(PVA/PVP) were determi...