Single injection methods for obtaining conductance measurements within luminal organs using impedance devices
First Claim
1. A method for obtaining one or more conductance measurements using an impedance device, the method comprising the steps of:
- introducing at least part of an impedance device into a mammalian luminal organ, the impedance device comprising an elongated body and a detector positioned along the elongated body and calibrated based on a conductivity of a first solution so that the conductivity of the first solution is known;
obtaining a first conductance measurement using the detector, the first conductance measurement indicative of a fluid native to the mammalian luminal organ;
obtaining a second conductance measurement using the detector, the second conductance measurement indicative of a first injection of the first solution through a lumen of an outer sheath surrounding at least part of the impedance device; and
calculating a size parameter of the mammalian luminal organ based in part upon the first conductance measurement, the second conductance measurement, and a known distance between detection electrodes of the detector;
wherein the first conductance measurement and the second conductance measurement are obtained when the outer sheath does not surround the detector.
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Abstract
Single injection methods for obtaining conductance measurements within luminal organs using impedance devices. In at least one method embodiment, the method is performed by introducing at least part of an impedance device into a mammalian luminal organ, the impedance device comprising an elongated body and a detector positioned along the elongated body, obtaining conductance measurements indicative of a fluid native to the mammalian luminal organ and indicative of a fluid injection while the detector is present within and outside of the lumen of the outer sheath, and calculating a size parameter of the mammalian luminal organ based in part upon some of the obtained conductance measurements.
51 Citations
20 Claims
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1. A method for obtaining one or more conductance measurements using an impedance device, the method comprising the steps of:
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introducing at least part of an impedance device into a mammalian luminal organ, the impedance device comprising an elongated body and a detector positioned along the elongated body and calibrated based on a conductivity of a first solution so that the conductivity of the first solution is known; obtaining a first conductance measurement using the detector, the first conductance measurement indicative of a fluid native to the mammalian luminal organ; obtaining a second conductance measurement using the detector, the second conductance measurement indicative of a first injection of the first solution through a lumen of an outer sheath surrounding at least part of the impedance device; and calculating a size parameter of the mammalian luminal organ based in part upon the first conductance measurement, the second conductance measurement, and a known distance between detection electrodes of the detector; wherein the first conductance measurement and the second conductance measurement are obtained when the outer sheath does not surround the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for obtaining one or more conductance measurements using an impedance device, the method comprising the step of:
calculating a size parameter within a mammalian luminal organ using a first conductance measurement indicative of a fluid native to the mammalian luminal organ and obtained using an impedance device having a detector calibrated based on a conductivity of a first solution so that the conductivity of the first solution is known, a second conductance measurement indicative of a first injection of the first solution through a lumen of an outer sheath surrounding at least part of the impedance device, and a distance between electrodes of the impedance device, wherein the first conductance measurement and the second conductance measurement are obtained when the outer sheath does not surround the detector.
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18. A method for obtaining one or more conductance measurements using an impedance device, the method comprising the step of:
calculating a size parameter within a mammalian luminal organ using a first conductance measurement indicative of a fluid native to the mammalian luminal organ and obtained using an impedance device selected from the group consisting of an impedance catheter and an impedance wire and having a detector calibrated based on a conductivity of a first solution so that the conductivity of the first solution is known, a second conductance measurement indicative of a first injection of the first solution through a lumen of an outer sheath surrounding at least part of the impedance device and obtained when a threshold/desired parameter is achieved, and a distance between electrodes of the impedance device, wherein the first conductance measurement and the second conductance measurement are obtained when the outer sheath does not surround the detector. - View Dependent Claims (19, 20)
Specification