Anisotropic etching in (3 1 1) Si to fabricate sharp resorbable polymer microneedles carrying neural electrode arrays

Polymer microneedles that get resorbed after insertion in the body have several interesting applications, for example in the insertion of ultra-flexible electrode arrays in neural tissue. In this work, we explore the use of molds created by etching in (3 1 1) silicon as a basis for the fabrication of such microneedles. Such molds can be etched anisotropically to much sharper angles compared to standard (1 0 0) silicon. It is demonstrated that sharp poly lactic-co-glycolic acid (PLGA) microneedles can be fabricated using the molds. It is also shown that by simple thermal bonding the fabricated PLGA microneedles can be combined with an ultra-flexible polyimide-based thin-film electrode array.

Publication year:2019

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BOF-publication weight:1

CSS-citation score:1

Authors from:Government, Higher Education

Accessibility:Open