Methods for Generating Luminal Organ Profiles Using Impedance

摘要

Methods to generate luminal organ profiles using impedance. One embodiment of such a method comprises the steps of introducing an impedance device having at least two detection electrodes positioned in between at least two excitation electrodes into a treatment site of a luminal organ at a first position, measuring a first treatment site conductance at the first position using the impedance device and at least two injections of solutions having different conductivities, moving the impedance device to a second position in the luminal organ, measuring a second treatment site conductance at the second position using the impedance device and the at least two injections of solutions having different conductivities, calculating a first position cross-sectional area using the first treatment site conductance and a second position cross-sectional area using the second treatment site conductance, and constructing a profile of the treatment site.

主权项

1. A method for measuring a cross-sectional area of a lumen, comprising:
introducing an impedance device into a treatment site of the lumen, the impedance device having at least two detection electrodes positioned between at least two excitation electrodes; measuring a first conductance at a proximal end of a segment of the lumen using the impedance device and a second conductance at a distal end of the segment of the lumen using the impedance device; calculating a first position cross-sectional area using the first conductance and a second position cross-sectional area using the second conductance; calculating a first total conductance of the proximal end of the segment of the lumen and a second total conductance of the distal end of the segment of the lumen; calculating a first coefficient ratio based upon the first total conductance and the first cross-sectional area and a second coefficient ratio based upon the second total conductance and the second cross-sectional area; linearly interpolating along a length between the proximal end of the segment of the lumen and the distal end of the segment of the lumen to determine a third coefficient ratio for an intermediary point between the proximal end of the segment of the lumen and the distal end of the segment of the lumen; and determining a third cross-sectional area of the intermediary point based on the third coefficient ratio, the first total conductance, and the second total conductance.