Shape Memory Alloy Capsule Micropump for Drug Delivery Applications

A method for actuating a pump, comprising:

• (a) having an actuation mechanism for the pump, wherein the actuation mechanism comprising:
• (i) a tubular structure with a first end and a second end, and with an outer surface, wherein the outer surface has helical grooves over a length in between the first end and the second end of the outer surface,
• (ii) a shape memory alloy coiled-wire positioned over the length and in the helical grooves, wherein the position allows for a space between the shape memory alloy coiled-wire and helical grooves for the shape memory alloy coiled-wire to twist freely;
• and
• (iii) an enclosure fitting encompassing the tubular structure therewith the shape memory alloy coiled-wire and the helical grooves;
• (b) placing a fluid inside the tubular structure;
• and
• (c) activating the shape memory alloy coiled-wire which causes a shortening of the tubular structure over the length in between the first end and the second end and therewith a compression of the fluid resulting in a release of a fluid from the tubular structure.