Controlling a drug delivery micropump using surface acoustic wave correlator

A secure self-biased remote controller for precisely adjusting the micropump of a drug delivery system, working at 956 MHz, is proposed. The controller transceiver is secured by using a Barker code sequence. Surface acoustic wave device, as a bandpass filter, is designed with minimum insertion loss and a sharp bandwidth matching the single frequency of operation. In the receiver, a correlation is introduced between input codded electromagnetic wave and output Inter Digital Transducers (IDTs), creating an output voltage that electrostatically actuates the micropump diaphragm. The finite element simulation results show that the actuation voltage is a function of the coded input signal. Besides, a maximum voltage with amplitude of 5.8 V is created only at coded frequency. The generated voltage creates 9.3353 nm displacement in the conductive microdiaphragm of the micropump.