JRM Vol.25 No.4 pp. 755-761
doi: 10.20965/jrm.2013.p0755


Development of Minimally Invasive Microneedle Made of Tungsten – Sharpening Through Electrochemical Etching and Hole Processing for Drawing up Liquid Using Excimer Laser –

Takahiro Tanaka, Tomokazu Takahashi, Masato Suzuki,
and Seiji Aoyagi

Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan

December 1, 2012
June 28, 2013
August 20, 2013
tungsten microneedle, hole fabrication by micro electro mechanical system (MEMS), sampling liquid

A tungsten needle was fabricated by electrochemically etching a thin wire with a diameter of 100 µm, with the goal of using it in minimally invasive medical treatments. The sharpness and smoothness of the tip were effective for easy insertion because they provided a large stress concentration and small amount of friction, respectively. An experiment involving the insertion of the fabricated needle into artificial skinmade of silicone rubber was carried out. The resistance force during the insertion was greatly reduced because of the small size of the needle, which was comparable to a mosquito’s proboscis. Despite the ultra-thin shape, the microneedle neither buckled nor broke because of the high hardness of the tungsten material. A hole was fabricated in the tungsten needle using excimer laser processing and electrochemical etching. Water and blood sampling were successfully achieved using this needle.

Cite this article as:
Takahiro Tanaka, Tomokazu Takahashi, Masato Suzuki, and
and Seiji Aoyagi, “Development of Minimally Invasive Microneedle Made of Tungsten – Sharpening Through Electrochemical Etching and Hole Processing for Drawing up Liquid Using Excimer Laser –,” J. Robot. Mechatron., Vol.25, No.4, pp. 755-761, 2013.
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