The development of a new type of compound peristaltic micropump

Microfluid devices have increasing application as analytical systems, biomedical devices, tools for chemistry and biochemistry. Micropump as the carrier of micro-fluidic has attracted more and more attention. In this paper, we propose a new prototype model of a peristaltic micropump using SMA (shape memory alloy) spring actuator as the servo actuator. We simulated the fashion of intestines peristalsis and realized a kind of peristaltic micropump that driving internally. At the same time we introduced the concept of compound output and proposed a kind of compound peristaltic micropump that the mixed liquid flow can be controlled. This paper describes the new structure and the motion mechanism of the micropump and discusses the possibility of the micropump. The flow characteristic of the micropump is measured. The experimental results indicate that the micropump has the satisfactory responses, it is able to make a microflow and the flow proportion can be controlled. This micropump can be applied widely in biomedical applications.