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In-Plane Si Microneedles: Fabrication, Characterization, Modeling and Applications

期刊

MICROMACHINES
卷 13, 期 5, 页码 -

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MDPI
DOI: 10.3390/mi13050657

关键词

silicon; microneedle; in-plane; drug delivery; sample collection; sensing; CMOS compatible

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Microneedles have attracted increasing attention in research and commercialization due to their advantages over traditional hypodermic needles. In-plane silicon microneedles, with their inherent properties and structural advantages, have been the focus of study. This article provides a review of in-plane silicon microneedles, covering fabrication techniques, theoretical and numerical analysis, experimental characterization, applications, challenges, and prospects.
Microneedles are getting more and more attention in research and commercialization since their advancement in the 1990s due to the advantages over traditional hypodermic needles such as minimum invasiveness, low material and fabrication cost, and precise needle geometry control, etc. The design and fabrication of microneedles depend on various factors such as the type of materials used, fabrication planes and techniques, needle structures, etc. In the past years, in-plane and out-of-plane microneedle technologies made by silicon (Si), polymer, metal, and other materials have been developed for numerous biomedical applications including drug delivery, sample collections, medical diagnostics, and bio-sensing. Among these microneedle technologies, in-plane Si microneedles excel by the inherent properties of Si such as mechanical strength, wear resistance, biocompatibility, and structural advantages of in-plane configuration such as a wide range of length, readiness of integration with other supporting components, and complementary metal-oxide-semiconductor (CMOS) compatible fabrication. This article aims to provide a review of in-plane Si microneedles with a focus on fabrication techniques, theoretical and numerical analysis, experimental characterization of structural and fluidic behaviors, major applications, potential challenges, and future prospects.

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