Pathology

Proboscis

Optoelectronics

Silicon nitride

Alternative medicine

Layer (electronics)

Etching (microfabrication)

Biomedical engineering

Deep reactive-ion etching

Medicine

Reactive-ion etching

Fabrication

Nanotechnology

Materials science

Silicon

Molding (decorative)

Anatomy

Engineering

Composite material

Silicon oxide

Sensors and Actuators A Physical

Aiming at the use in low-invasive medical treatments, this paper proposes a realistic imitation of mosquito's proboscis. A silicon needle is electrochemically etched, making the three-dimensionally sharp tip with finely smooth surface. The jagged shank shape is machined by a deep reactive ion etching (DRIE). The combined needles comprising a central straight needle and two outer jagged needles are fabricated, imitating a labrum and two maxillas of the mosquito, respectively. The cooperative motion of the three needles imitating the mosquito's motion is realized by applying PZT actuators independently to all the needles. The effectiveness of inserting these needles cooperatively was experimentally confirmed. Considering practical medical application, a biodegradable polymer needle with three-dimensionally sharp tip is also developed. The fabrication process based on micromolding is as follows: a nickel negative cavity is made by electroplating on a silicon sharp needle, to which melted polymer is injected, and...

Realistic imitation of mosquito's proboscis: Electrochemically etched sharp and jagged needles and their cooperative inserting motion