Patent ID: 8433385

Claim:
An analyte measuring system comprising: an implantable medical device comprising: an electrode connecting arrangement connectable to at least two implantable electrodes; a signal source that generates a current or voltage signal and for applying said current or voltage signal to a tissue using said at least two implantable electrodes; a signal measurer that measures a resulting voltage or current signal from said tissue sensed by said at least two implantable electrodes; an impedance determiner that determines an impedance signal based on said generated current or voltage signal and said measured resulting voltage or current signal; and a signal processor that generates an estimate of a concentration of an analyte in said tissue by making a spectral analysis of said impedance signal determined by said impedance determiner; wherein said signal processor generates said estimate of said analyte concentration based on a ratio of an amplitude of said impedance signal at a first frequency and an amplitude of said impedance signal at a second frequency; and wherein said signal processor generates said estimate of said analyte concentration based on a comparison of said ratio and a corresponding ratio determined by said signal processor based on a spectral analysis of a reference impedance signal determined based on a previously applied current or voltage signal and a previously measured resulting voltage or current signal.