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;
obtaining a first conductance measurement using the detector while the detector is surrounded by an outer sheath surrounding at least part of the impedance device, the first conductance measurement indicative of a fluid native to the mammalian luminal organ present within a lumen of the outer sheath;
obtaining a second conductance measurement using the detector while the detector is surrounded by the outer sheath, the second conductance measurement indicative of a first injection of a first solution of a first compound through the lumen of the outer sheath;
moving the impedance device and/or the outer sheath relative to one another so that the outer sheath no longer surrounds the detector;
obtaining a third conductance measurement using the detector, the third conductance measurement indicative of the fluid native to the mammalian luminal organ;
obtaining a fourth conductance measurement using the detector, the fourth conductance measurement indicative of a second injection of the first solution through the lumen of the outer sheath; and
calculating a size parameter of the mammalian luminal organ based in part upon the third conductance measurement, the fourth conductance measurement, and a conductivity of the fluid native to the mammalian luminal organ determined in part from the first conductance measurement.
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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.
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Citations
21 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; obtaining a first conductance measurement using the detector while the detector is surrounded by an outer sheath surrounding at least part of the impedance device, the first conductance measurement indicative of a fluid native to the mammalian luminal organ present within a lumen of the outer sheath; obtaining a second conductance measurement using the detector while the detector is surrounded by the outer sheath, the second conductance measurement indicative of a first injection of a first solution of a first compound through the lumen of the outer sheath; moving the impedance device and/or the outer sheath relative to one another so that the outer sheath no longer surrounds the detector; obtaining a third conductance measurement using the detector, the third conductance measurement indicative of the fluid native to the mammalian luminal organ; obtaining a fourth conductance measurement using the detector, the fourth conductance measurement indicative of a second injection of the first solution through the lumen of the outer sheath; and calculating a size parameter of the mammalian luminal organ based in part upon the third conductance measurement, the fourth conductance measurement, and a conductivity of the fluid native to the mammalian luminal organ determined in part from the first conductance measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. 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; obtaining a first conductance measurement using the detector while the detector is surrounded by an outer sheath surrounding at least part of the impedance device, the first conductance measurement indicative of blood from the mammalian luminal organ present within a lumen of the outer sheath; moving the impedance device and/or the outer sheath relative to one another so that the outer sheath no longer surrounds the detector; obtaining a second conductance measurement using the detector, the second conductance measurement indicative of the blood; obtaining a third conductance measurement using the detector, the third conductance measurement indicative of an injection of saline through the lumen of the outer sheath; and calculating a size parameter of the mammalian luminal organ based in part upon the second conductance measurement, the third conductance measurement, and a known distance between detection electrodes of the detector. - View Dependent Claims (20)
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21. 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; obtaining a first conductance measurement using the detector while the detector is surrounded by an outer sheath surrounding at least part of the impedance device, the first conductance measurement indicative of a fluid native to the mammalian luminal organ present within a lumen of the outer sheath; obtaining a second conductance measurement using the detector while the detector is surrounded by the outer sheath, the second conductance measurement indicative of a first injection of a first solution of a first compound through the lumen of the outer sheath; moving the impedance device and/or the outer sheath relative to one another so that the outer sheath no longer surrounds the detector; obtaining a third conductance measurement using the detector, the third conductance measurement indicative of the fluid native to the mammalian luminal organ; obtaining a fourth conductance measurement using the detector, the fourth conductance measurement indicative of a second injection of the first solution through the lumen of the outer sheath; moving the at least part of the impedance device to a second location within the mammalian luminal organ; obtaining a fifth conductance measurement using the detector, the fifth conductance measurement indicative of the fluid native to the mammalian luminal organ at the second location; obtaining a sixth conductance measurement using the detector, the sixth conductance measurement indicative of a third injection of the first solution through the lumen of the outer sheath; calculating a first size parameter of the mammalian luminal organ based in part upon the third conductance measurement, the fourth conductance measurement, and a conductivity of the fluid native to the mammalian luminal organ determined in part from the first conductance measurement; and calculating a second size parameter of the mammalian luminal organ at the second location based in part upon the fifth conductance measurement and the sixth conductance measurement.
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Specification