Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 139, Issue 1-2, Pages 293-302Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2006.11.022
Keywords
polymer material; polylactic acid (PLA); excimer laser processing; high aspect ratio hole; PLA microneedle
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The present paper reports the fabrication of long thin holes with a high aspect ratio of 100 (diameter: 10 mu m, depth: I mm) in biodegradable polymer material (polylactic acid, referred to herein as PLA) using a UV excimer laser. Holes having diameters of 10, 20 and 50 mu m are fabricated from the side surface of a PLA sheet, and their fabricated shapes are observed using an optical microscope. These holes are compared with holes fabricated in other polymer sheets. It is proven that a long thin hole can be fabricated in PLA material, although at a lower fabrication rate compared that for epoxy material. This laser fabrication is applied to a PLA microneedle, which is fabricated by the micromolding technique. A hole is fabricated along the centerline of the newly developed microneedle, and it is confirmed experimentally that blood plasma is taken into this hole by capillary force. (c) 2006 Elsevier B.V. All rights reserved.
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