Geometrical Effects in Mechanical Characterizing of Microneedle for Biomedical Applications

P. Aggarwal and C. Johnston
University of Calgary, CA

Keywords: microneedles, mechanical forces, finite element modeling, skin resistance, piezoelectric sensing

Abstract:
This paper discusses the design and implementation of MEMS microneedle with emphasis on integrated functionality for sensing the forces. The idea is based on the requirements of strength, robustness, and minimal insertion pain and tissue damage in patients The constraints of minimal microneedle dimension, force withstanding capabilities and their relations are the main basis for final design dimensions. Therefore, the design gives the efficient dimensions of the microneedle, while considering the influence of various mechanical forces and skin resistive forces. The design is extended by giving complete fabrication steps of the proposed microneedle design. Three piezoelectric sensors are fabricated on the microneedle, which reliable skin resistance measurement for different insertion depth. Performance analysis at the end proves the validity of the proposed design approach for different geometries and sizes.

Nanotech 2004 Conference Technical Program Abstract