16 February 2018 Fabrication of hollow microneedles by optical vortex illumination
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Abstract
Molding technologies are mostly employed to fabricate microneedles (MNs) for medical and cosmetic applications, such as drug delivery and skin care systems. However, such technologies are ill suited for bioabsorbable materials with high viscosity, thus, there is no report concerning hollow bioabsorbable MNs, so far.

We propose a novel laser processing technology, which enables us to fabricate a hollow bioabsorbable MN by simply irradiating both optical vortex for fabricating MNs and Gaussian beam for drilling holes on a hyaluronic acid sheet.
Conference Presentation
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Yoichi Oikawa, Yoichi Oikawa, Kohei Toyoda, Kohei Toyoda, Dexiang Wang, Dexiang Wang, Kunio Miyaji, Kunio Miyaji, Takashige Omatsu, Takashige Omatsu, } "Fabrication of hollow microneedles by optical vortex illumination", Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 1051915 (16 February 2018); doi: 10.1117/12.2289035; https://doi.org/10.1117/12.2289035
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