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Apparatus for measuring the electrical response of living tissue

  • US 3,085,566 A
  • Filed: 09/18/1959
  • Issued: 04/16/1963
  • Est. Priority Date: 09/18/1959
  • Status: Expired due to Term
First Claim
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1. APPARATUS FOR MEASURING ELECTRICAL CHARACTERISTICS, INCLUDING A COMPONENT OF TISSUE IMPEDANCE, OF BIOLOGICAL TISSUE DISPOSED BETWEEN A PAIR OF CONTACTING ELECTRODES WHICH COMPRISES AN ALTERNATING CURRENT SUPPLY A.-C. COUPLED TO SAID ELECTRODES, SAID SUPPLY HAVING AN IMPEDNANCE WHICH IS HIGH COMPARED TO THE IMPEDANCE OF THE TISSUE TO BE MEASURED SO AS TO PASS A SUBSTANTIALLY CONSTANT AMPLITUDE ALTERNATING CURRENT THERETHROUGH WHICH IS SUBSTANTIALLY UNAFFECTED BY CHANGES IN TISSUE IMPEDANCE, SAID CURRENT BEING BELOW THE LEVEL OF TISSUE RESPONSE THERETO, AN AMPLIFIER FOR AMPLIFYING THE ALTERNATING VOLTAGE DEVELOPED BETWEEN SAID ELECTRODES, SAID AMPLIFIER HAVING AN INPUT IMPEDANCE WHICH IS HIGH COMPARED TO THE IMPEDANCE OF THE TISSUE TO BE MEASURED, AND MEANS FOR MEASURING THE AMPLITUDE OF SAID AMPLIFIED ALTERNATING VOLTAGE TO OBTAIN A MEASUREMENT OF A COMPONENT OF TISSUE IMPEDANCE.

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