Proposal of Minimal Invasive Shape Memory Alloy Double-Transducer Unit for Blood Analysis or Drug Delivery

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The purpose of this research is to develop minimally invasive medical devices by applying heated actuations of Shape Memory Alloy (SMA) transducers using a medical Ti-Ni alloy in order to enable minimal hypodermic invasive microvolume for either blood suction or drug delivery through the use of a nontoxic and minimal edged microneedle to be created in the authors laboratory. The author has focused on lymphocytes for immunotoxin and erythrocytes for the glucose level in blood. This paper reports the double-action mechanisms of the compact unit during its development and its actions by low DC inputs. Joules heating of an SMA coil spring transducer might be useful for indenting blood vessels whose diameter is larger than the microneedle as a result of generating an indentation stroke of 2.0 mm and recovery force of 0.25 N 0.23 s following the start of moving when applied to DC 2.0 V and 0.5 A. An octagonal-pyramidal foil transducer for blood suction recovered its plane condition as before octagonal-pyramidal forming 8.3 s following the start of moving when applied to DC 1.5 V and 2.0 A.