Conductance catheter
First Claim
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.
1 Assignment
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Accused Products
Abstract
Conductance catheter apparatus for measuring the volume of a biological chamber, the apparatus including a catheter employing a plurality of electrodes along its length, the plurality including outer transmitting electrodes and intermediate potential sensing electrodes between the outer electrodes, an alternating current source connected to provide alternating currents at high and low frequencies to the outer transmitting electrodes, processing circuitry connected to the intermediate potential sensing electrodes for processing potential signals to obtain conductance signals indicating high frequency and low frequency conductance and for using the conductance signals to determine volume in a manner that excludes parallel conductance through the wall of the chamber and surrounding tissue.
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Citations
20 Claims
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1. Conductance catheter-apparatus for measuring the volume of a biological chamber having a wall, said apparatus comprising
a 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, and processing 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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11. A method of measuring the volume of a biological chamber having a wall, said method comprising
placing a catheter employing a plurality of electrodes along its length in said biological chamber, said plurality including outer drive electrodes and intermediate potential sense electrodes between said outer electrodes, applying alternating currents at high and low frequencies to said outer drive electrodes, processing potential signals provided by said sense electrodes to obtain a high-frequency conductance signal and a low-frequency conductance signal, and using said conductance signals to determine volume in a manner that excludes parallel conductance through the wall of said chamber and surrounding tissue.
Specification