An Optimal Micropatterned End-Effecter for Enhancing Frictional Force on Large Intestinal Surface

Title
An Optimal Micropatterned End-Effecter for Enhancing Frictional Force on Large Intestinal Surface
Authors
이성훈김영태양성욱윤의성김대은서갑양
Keywords
Friction; Colon endoscope; Microfabrication; End effector; Surface Patterning
Issue Date
2010-05
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 2, NO 5, 1308-1316
Abstract
We present a simple surface modification method for enhancing the frictional properties on soft, viscoelastic tissue of large intestine by integrating micropatterned structures with controlled shape and geometry. The micropatterned end-effecter (EE) was fabricated onto micromachined EE body (20 mm long, 2 mm diameter cylinders) in the forms of line, box, pyramid, and bottle shape by utilizing capillary molding technique with UV-curable poly(urethane acrylate) (PUA) polymer. To evaluate the frictional behavior of micropatterned EE, we employed a biotribotester, for easy loading and test of a biological organ specimen. It was found that the frictional properties of micropatterned EE are heavily dependent upon the shape of microstructure. The patterned EE with parallel lines (to the direction of locomotion) showed better frictional performance (average frictional coefficient ∼1.53 and maximum ∼3.98) compared with other micropatterned EEs (average frictional coefficient 0.72-0.94 and maximum 1.78-2.49) and nonpatterned EE (average frictional coefficient ∼0.58 and maximum ∼1.51). In addition, various geometric parameters (e.g., height, width, and space) as well as operating conditions (e.g., contact load and sliding speed) were systematically investigated for probing optimal anchoring function of the parallel line patterned EE.
URI
http://pubs.kist.re.kr/handle/201004/40951
ISSN
1944-8244
Appears in Collections:
KIST Publication > Article
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