Patent ID: 6542765
Filing Date: 2003-04-01
Classification: A61B,A61M,A61N

Abstract:
A method of sampling a substance present in a subject, said method comprising:(a) placing a first collection reservoir comprising an electrically conducting medium in contact with a skin surface of said subject, wherein said first reservoir is in electrical contact with a first electrode; (b) placing a second collection reservoir comprising an electrically conducting medium in contact with a separate skin surface of said subject, wherein said second reservoir is in electrical contact with a second electrode; (c) sampling the substance by establishing a potential between said first and second electrodes such that detectable levels of said substance and/or at least one of its metabolites is extracted into said first and second collection reservoirs; and (d) measuring the level of said extracted substance and/or metabolites present in each of said first and second collection reservoirs to obtain first and second measurements.