Diagnosis of a condition of the skin using impedance

摘要

A medical apparatus for diagnosing a diseased condition of the skin of a subject comprising unasonda (80) electrically conductive including a plurality of electrodes (83a-83c), each electrode (83a-83c) a plurality of micro-needles (20), wherein said probe (80) is adapted to be placed against a surface of the subject such that said micro-needles (20) penetrate the stratum corneum, wherein said medical device is adapted to initiate a demedida session impedance including passing an electric current through the electrodes (83a -83c) to obtain values ​​of skin impedance and to use reference data to determine whether the obtained impedance valoresde indicate the disease state, in which the micro -sewing (20) of a first electrode (83a) and a second electrode (83b) are separadaslateralmente a first distance from each other and the micro-needles (20) of the first electrode (83a) Yde one third electrode (83c) are laterally spaced a second distance from each other, said apparatus adapted to gradually change a ratio of a potential between loselectrodos first (83a) and second (83b) and between the first electrode (83a) and the third being (83c) for get_vals first and second skin impedance or a mixture of skin impedance values ​​entrevalores obtained using the first and second electrodes and the values ​​obtained using the third and electrodosprimero; and wherein each electrode (83a-83c) comprises a base substrate (12; 86), said micro-needles (20) formed being integrally with said base substrate (12; 86) and arranged laterally spaced some other high and having a length being sufficient to penetrate the stratum corneum, having said microneedles (20) a substantially triangular cross section parallel to the base substrate (12; 86), yestando said microneedles (20) provided with an oblique surface (24) such seccióntransversal that parallel to the substrate base (12; 86) tapers continuously from the base substrate (12; 86).