Systems and methods for determining phasic cardiac cycle measurements
First Claim
1. A method for determining a phasic change in a vessel, the method comprising the steps of:
- introducing a device into a site within a vessel, the device comprising;
a pair of excitation electrodes positioned along a portion of the device; and
a pair of detection electrodes positioned along a portion of the device, the pair of detection electrodes comprising two detection electrodes having a known distance from one another, the pair of detection electrodes physically positioned in between the pair of excitation electrodes along a portion of the device;
operating the device in connection with two or more fluid injections in the vessel at or near the site to obtain two or more conductance values;
calculating at least one parallel conductance value and at least one total conductance value at or near the site based upon at least two of the two or more conductance values; and
calculating a phasic change in the at least one vessel parameter based upon the known distance of the two detection electrodes from one another, the calculated at least one parallel conductance value, and the calculated at least one total conductance value.
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Accused Products
Abstract
The disclosure of the present application provides for systems and methods for determining a phasic change in a vessel and vessel compliance. In at least one exemplary method for determining a phasic change in a vessel, the method comprises the steps of introducing a device into a site within a vessel, operating the device in connection with two or more fluid injections in the vessel to obtain two or more conductance values, calculating a parallel conductance value and a total conductance value, and calculating a phasic change in at least one vessel parameter based in part upon the calculated parallel conductance value and the calculated total conductance value. In an exemplary method for determining vessel compliance, the method comprises, in part, the steps of calculating a first vessel parameter and a second vessel parameter based on at least two conductance values, calculating a change in vessel parameter based upon the first and second vessel parameters, and calculating vessel compliance based upon the relationship between the change in vessel parameter and a change in pressure during a cardiac cycle.
55 Citations
28 Claims
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1. A method for determining a phasic change in a vessel, the method comprising the steps of:
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introducing a device into a site within a vessel, the device comprising; a pair of excitation electrodes positioned along a portion of the device; and a pair of detection electrodes positioned along a portion of the device, the pair of detection electrodes comprising two detection electrodes having a known distance from one another, the pair of detection electrodes physically positioned in between the pair of excitation electrodes along a portion of the device; operating the device in connection with two or more fluid injections in the vessel at or near the site to obtain two or more conductance values; calculating at least one parallel conductance value and at least one total conductance value at or near the site based upon at least two of the two or more conductance values; and calculating a phasic change in the at least one vessel parameter based upon the known distance of the two detection electrodes from one another, the calculated at least one parallel conductance value, and the calculated at least one total conductance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for determining a phasic change in a vessel, the method comprising the steps of:
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introducing a device into a site within a vessel, the device comprising; a catheter having a lumen, a proximal end, and a distal end; a pair of excitation electrodes positioned along a portion of the device at or near the distal end of the device; and a pair of detection electrodes positioned along a portion of the device at or near the distal end of the device, the pair of detection electrodes comprising two detection electrodes having a known distance from one another, the pair of detection electrodes physically positioned in between the pair of excitation electrodes along a portion of the device; operating the device in connection with two or more fluid injections in the vessel at or near the site to obtain two or more conductance values, wherein the two or more conductance values are retrieved by a data acquisition and processing system operably connected to the device; calculating at least one parallel conductance value and at least one total conductance value at or near the site based upon at least two of the two or more conductance values; calculating a phasic change in the at least one vessel parameter using the data acquisition and processing system based upon the known distance of the two detection electrodes from one another, the calculated at least one parallel conductance value, and the calculated at least one total conductance value; and determining the extent of vessel disease based upon the calculated phasic change in the at least one vessel parameter, wherein the extent of vessel disease is determined to be relatively low if the calculated phasic change in the at least one vessel parameter is relatively high, and wherein the extent of vessel disease is determined to be relatively high if the calculated phasic change in the at least one vessel parameter is relatively low.
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28. A system for determining a phasic change in a vessel, the system comprising:
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a device capable of acquiring conductance data, the device comprising; a pair of excitation electrodes positioned along a portion of the device; and a pair of detection electrodes positioned along a portion of the device, the pair of detection electrodes comprising two detection electrodes having a known distance from one another, the pair of detection electrodes physically positioned in between the pair of excitation electrodes along a portion of the device; an injection source for injecting one or more solutions through the device to a target site; a current source for providing current to the device; and a data acquisition and processing system that receives conductance data from the device, wherein the data acquisition and processing system is operable to calculate a phasic change in the at least one vessel parameter based upon; a. the known distance of the two detection electrodes from one another; and b. a calculated at least one parallel conductance value and a calculated at least one total conductance value, each value calculated based upon the conductance data acquired from the device.
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Specification