This paper describes a proof of concept of a microfluidic dipole to sample cerebral fluid. It consists of a portable microfluidic probe which injects a buffer in one inlet and draws it from the other one after passing through a contact zone with the external liquid. Finite elements method modelling (FEM) shows a very stable liquid flow across the complete probing area. Furthermore, we determined that a design generating turbulence is likely to be more useful to capture brain molecules. Molecules displacement due to diffusion phenomena takes about 25 ms to diffuse over a 1 mm probe gap. Finally, our experiment showed that, to obtain a stable flow without turbulence the maximum inlet and outlet pressure is 0.05 mPa for the two tested configuration of dipole.
Wire-free power supplies provide portability, flexibility and cost efficiency as they reduces hardware complexity. Thus, in this paper we designed a portable pH sensor based on a microbial fuel cell (MFC) as a wire free energy source. Our MFCs supplied 0.127 mW to power our ultra-low power portable pH sensor. The error of the newly designed pH sensor is less than 5% when pH is between 4 and 10. Also it provides, an autonomy of 4 hours when the pH sensor is continuously used.
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