Mosquito inspired microneedle
Mosquito bite inspires less painful injection
with a diameter of 0.1 millimetres. They etched slices of silicon dioxide into a
jagged shape and bonded them together. There are two serrated shanks that form the outer surface of the needle. A central shaft then slides between them to inject or withdraw the sample. The needle is connected to a small reservoir that is equipped with an optical sensor to analyze samples.
for instance used in diabetic patients to monitor blood-glucose levels.
surface area to nerves, causing pain to the human subject.
touches the nerves of the skin at fewer points than a smooth surface like a
needle. Much less contact area translates into much less pain. These seven moving parts consist of various serrated outer segments (maxillae) and a smooth inner shaft (labrum).
Izumi H, Suzuki M, Aoyagi S, Kanzaki T. 2011. Realistic imitation of mosquito's proboscis: Electrochemically etched sharp and jagged needles and the cooperative inserting motion. Sensor Actuat A:Phys. 100(1): 115-123.