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PHYSIOLOGICAL IMPEDANCE-MEASURING APPARATUS

  • US 3,608,543 A
  • Filed: 10/03/1968
  • Issued: 09/28/1971
  • Est. Priority Date: 10/03/1968
  • Status: Expired due to Term
First Claim
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1. In a physiological measuring apparatus, the combination comprising a pair of electrodes adapted for spaced application to predetermined locations of the anatomy, an additional electrode spacedly juxtaposed to one of said first-mentioned electrodes, circuit means for applying an impedance-measuring voltage only across said first-mentioned electrodes and a portion of said anatomy when juxtaposed therebetween and for applying a potential to said additional electrode similar to that on the associated one of said first-mentioned electrodes, and an impedance-meauring circuit coupled to said electrodes and to said circuit means for measuring anatomical impedance only between a predetermined pair of said electrodes, said circuit comprising a substantially unity gain amplifier for applying a substantially identical potential at lower impedance to said additional electrode for driving the same.

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