The skin preparation device and sensor of the present invention include an array of rigid tines. The tines serve to "self-prepare" the skin at each electrode site. These tines, when pressed against the skin, penetrate the stratum corneum, thereby reducing skin impedance and improving signal quality. A self-prepping device of the present invention is an optimized array of short non-conductive rigid tines in which the individual tines are created in a geometry that allows for a sharp point at the tip when molding, machining or etching is used as a method of fabrication. This non- conductive array with rigid penetrating structures may, therefore, be used in combination with a conductive medium, preferably an ionic conductive gel. In penetrating the stratum corneum, micro-conduits are created in the layers of the skin enabling the conductive medium to reach the low impedance layers and to transmit bioelectrical signals from the skin to the electrode surface. Such a self-prepping device can be readily mass produced using molding methods or possibly other manufacturing methods, thereby providing for a low cost means of achieving improved performance of the biopotential sensor. Additionally this invention includes the integration of this self-prepping device into a biopotential sensor comprising an array of one or more electrodes.L’invention se rapporte à un dispositif pour préparer la peau et à un capteur comprenant un ensemble de dents rigides. Ces dents servent à « auto-préparer » la peau à chaque site d’électrode. Ces dents, lorsqu’elles sont appuyées contre la peau, pénètrent dans la couche cornée, ce qui réduit ainsi l’impédance de la peau et améliore la qualité du signal. Un dispositif d’auto-préparation de la présente invention est un ensemble optimisé de dents courtes et rigides non conductrices dans lequel les dents individuelles sont conçues en suivant une géométrie qui permet d’utiliser une pointe à son extrémité lorsqu’on recourt au moulage, à l’usinage ou à l
