Mechanical Failure Analysis of Needles, for Micro-needle Array Dry-electrodes
| Autor: | J. K. Radhakrishnan, U. K. Singh, V. C. Padaki |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
010405 organic chemistry chemistry.chemical_element Substrate (electronics) Tungsten 010402 general chemistry 01 natural sciences Poly(methyl methacrylate) General Biochemistry Genetics and Molecular Biology 0104 chemical sciences chemistry.chemical_compound Nickel chemistry visual_art Electrode visual_art.visual_art_medium General Pharmacology Toxicology and Pharmaceutics Polycarbonate Composite material General Agricultural and Biological Sciences Polyimide Polyurethane |
| Zdroj: | Defence Life Science Journal. 2:448 |
| ISSN: | 2456-0537 2456-379X |
| Popis: | Dry electrodes, which have an array of vertically aligned conducting micro-needles over a conducting substrate/base are most suitable for long-term continuous monitoring of EEG-signal, and overcomesthe disadvantages of conventional wet electrodes. A crucial design requirement for thesemicro-needlearrays, is the choice of the needle material with suitable mechanical strength to penetrate the skin without mechanical failure. This paper gives, the results of mechanical failure analysis of different needle materials that have been typically used/proposed for invasive use. A conical needle with 150μ width at the base and 10μ width at the tip, and length in the range 10μ - 200μ was taken up for calculation. The Critical load for failure, falls in the following descending order for the selected materials: viz., Carbon Nanofibre (CNF), Titanium-alloy (Ti 6-4), Single Crystal Silicon, Nickel, Tungsten, Platinum-Iridium (Pt90 percent-Ir10 percent), Stainless Steel (SS304),Poly Methyl Methacrylate (PMMA), Polyimide, Polycarbonate, Gold, Silver, Photoresist-SU8, Polyurethane and Poly DiMethylSiloxane (PDMS).Taking the most accepted value of 0.1N as the penetration force required for needle penetration into skin, it is seen that for a needle length of 100μ, the following materials, Carbon Nanofibre (CNF), Titanium-alloy (Ti 6-4), Single Crystal Silicon, Nickel, Tungsten, Platinum -Iridium (Pt90 percent-Ir10 percent) andStainless Steel (SS304), can penetrate the skin without mechanical failure. |
| Databáze: | OpenAIRE |
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