Proceedings Article | 14 December 2006
KEYWORDS: Shape memory alloys, Blood, Actuators, Liquids, Smart materials, Electromagnetism, Factor analysis, Mechanical engineering, Glucose, Skin
In actuator capabilities of a blood extraction, a quick response, a high output power and a highly precise
deflection of the smart material actuator for the blood extraction micro pump are prerequisite for a precise control
of the amount of blood extraction. In Bio-MEMS fields, the development of a micro pump driven by an
electromagnetic power, a piezoelectric element, electrostatic power and a shape memory alloy (SMA) such as a
smart material type and a vacuum type, are investigated. However, the piezoelectric micro pump has a slow
extraction speed. On the other hand, a vacuum type micro pump can extract blood very fast, however, it cannot
deliver a drug as a drug delivery system(DDS.).
In this research, we focus on the development of SMA type micro pump to extract blood by negative pressure
generated in extraction chamber using SMA. Because, SMA shows high work output per unit volume, high power
to mass ratio and the capability of being driven without high applied electric fields. In this research, the most
significant factors in the factors of a needle length, an inner and an outer diameter, numbers of cuts for the SMA
disk are optimized by using the experimental design method, which can estimate priority factors from a
comparatively small number of experiments are investigated. In the design of factors for the SMA type micro
pump, a reduction of the inner and outer diameter of the needle, the blood extraction volume and extraction time
are effective factors in order to mitigate a burden of diabetic patients. The effect of the length of the needle, and
especially the inner diameter of the needle showed 50% of contributing rate contribution for blood extraction
volume.
