doi: 10.3850/978-981-11-0749-8_727
Development of Micro Pump Actuated by Oxidative Expansion of Fe Powder
Hironori Kan, Tetsuhide Shimizu and Ming Yang
Graduate School of System Design. Tokyo Metropolitan University
Hino city 191-0065, Tokyo, Japan
Abstract
Application of MEMS (Micro Electrical Mechanical Systems) for medical treatment, such as Drug Delivery Systems (DDS) and so on, has reported and fabricated. However, most of the systems include micro pump is driven by electricity and with control circuit to deliver drugs. In this paper, the authors developed an energy-free DDS which bases on oxidative expansion of Fe powder for transdermal dispensing of drug. The influential factors on oxidative expansion were investigated by using various kinds of Fe powders, and a prototype of micro pump was fabricated using molding of polymer. The results show that it is important to prevent aggregation and increase fluidity of Fe powder during the oxidation, and Fe powder mixed with lubricant powder of 1.0 wet % has good condition of aggregation-proof during oxidative expansion. The micro pump can pumping liquid with flow rate of 0.8 µl /min under the backpressure of 5 kPa
Keywords: Micro pump, Fe, powder, Oxidative expansion, Drug delivery systems.
