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Device and method for measuring a property of living tissue

  • US 8,197,406 B2
  • Filed: 02/10/2004
  • Issued: 06/12/2012
  • Est. Priority Date: 12/02/2003
  • Status: Active Grant
First Claim
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1. A device for measuring a property of living tissue, in particular a glucose level of the tissue, said device comprisingan electrode arrangement for application to the tissue,a signal source for generating an AC voltage at a series of frequencies in a given frequency range to be applied to said electrode arrangement, andprocessing circuitry comprisingmeasuring means for measuring a series of measurement values at the series of frequencies, each measurement value depending on dielectric properties of the tissue at one frequency,fitting means for fitting a function M(f, b0, . . . , bK) with parameters b0 to bK to the measurement values at their given frequencies, or to values derived from the measurement values at their given frequencies, and determining the parameters b0 to bK thereby, andmeans for using at least part of the parameters b0 to bK for determining said property,wherein said processing circuitry comprises a measuring circuit having a first input for an input value dependent on said property and on said AC voltage and a second input for an input value dependent on said AC voltage but substantially independent of said property, wherein said measurement values are derived from a ratio between said first and said second input value.

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