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Conductance catheter

  • US 4,840,182 A
  • Filed: 04/04/1988
  • Issued: 06/20/1989
  • Est. Priority Date: 04/04/1988
  • Status: Expired due to Term
First Claim
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1. Conductance catheter-apparatus for measuring the volume of a biological chamber having a wall, said apparatus comprisinga catheter employing a plurality of electrodes along its length, said plurality including outer drive electrodes and intermediate potential sensing electrodes between said outer electrodes,an alternating current source connected to provide alternating currents at high and low frequencies to said outer drive electrodes, andprocessing means connected to said intermediate potential sensing electrodes for processing potential signals to obtain a high-frequency conductance signal and a low-frequency conductance signal and for using said conductance signals to determine volume in a manner that excludes parallel conductance through the wall of said chamber and surrounding tissue.

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