System and method to evaluate electrode position and spacing
First Claim
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1. A method of determining movement of a portion of a subject, comprising:
- positioning a first implantable lead having a first implantable electrode into a structure of the subject and positioning the first implantable electrode at a first location;
positioning a second implantable lead having a second implantable electrode into a structure of the subject and positioning the second implantable electrode at a second location;
positioning a third electrode on or in the subject;
injecting at least two axes of current into a volume of the subject;
determining a first impedance using the positioned first implantable electrode and the third electrode;
determining a second impedance using the positioned second implantable electrode and the third electrode;
executing instructions with a processor external to the subject to determine a plurality of sequential first positions of the first implantable electrode and a plurality of sequential second positions of the second implantable electrode based on the determined first impedance and the determined second impedance using the positioned first implantable electrode, the positioned second implantable electrode, and the third electrode;
calculating a unit vector;
projecting a first displacement vector representing motion of the positioned first implantable electrode onto the unit vector and a second displacement vector representing motion of the positioned second implantable electrode onto the unit vector;
illustrating a plurality of projected positions on a plane of the subject over time; and
determining motion of the structure of the subject based on the determined plurality of sequential first positions of the first implantable electrode and the plurality of sequential second positions of the second implantable electrode.
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Abstract
A method and apparatus for tracking and illustrating the location of leads positioned within the volume is disclosed. For example, the lead electrodes can be positioned within a heart of a patient that can be tracked over time. The lead electrodes can be tracked with an electrode potential or bioimpedance tracking system to determine the position of the lead electrodes. A method and apparatus is disclosed to analyze the position information for analyzing the selected position of the lead electrodes.
252 Citations
25 Claims
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1. A method of determining movement of a portion of a subject, comprising:
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positioning a first implantable lead having a first implantable electrode into a structure of the subject and positioning the first implantable electrode at a first location; positioning a second implantable lead having a second implantable electrode into a structure of the subject and positioning the second implantable electrode at a second location; positioning a third electrode on or in the subject; injecting at least two axes of current into a volume of the subject; determining a first impedance using the positioned first implantable electrode and the third electrode; determining a second impedance using the positioned second implantable electrode and the third electrode; executing instructions with a processor external to the subject to determine a plurality of sequential first positions of the first implantable electrode and a plurality of sequential second positions of the second implantable electrode based on the determined first impedance and the determined second impedance using the positioned first implantable electrode, the positioned second implantable electrode, and the third electrode; calculating a unit vector; projecting a first displacement vector representing motion of the positioned first implantable electrode onto the unit vector and a second displacement vector representing motion of the positioned second implantable electrode onto the unit vector; illustrating a plurality of projected positions on a plane of the subject over time; and determining motion of the structure of the subject based on the determined plurality of sequential first positions of the first implantable electrode and the plurality of sequential second positions of the second implantable electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining movement of a portion of a subject, comprising:
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positioning a first implantable lead having a first implantable electrode into a right heart portion of the subject and positioning the first implantable electrode at a first location in the right heart portion; positioning a second implantable lead having a second implantable electrode into a left heart portion of the subject and positioning the second implantable electrode at a second location in the left heart portion; selecting first pacing parameters; pacing the heart of the subject according to the selected first pacing parameters with the first implantable electrode and the second implantable electrode; tracking, relative to a reference portion, the location of the first implantable electrode in the right heart portion and the second implantable electrode in the left heart portion with an external tracking system; executing instructions with a processor external to the subject to determine a plurality of sequential first positions of the first implantable electrode and a plurality of sequential second positions of the second implantable electrode based on a determined impedance using both the positioned first implantable electrode and the positioned second implantable electrode; calculating a selected plane of the subject, the selected plane having a unit vector; projecting the plurality of first sequential positions and the plurality of second sequential positions onto the unit vector of the selected plane of the subject; and determining whether synchrony of the heart of the subject exists based on the projected plurality of first sequential positions and plurality of second sequential positions; wherein determining existence of synchrony of the heart includes observing the plurality of positions during pacing the heart. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system to determine motion of a structure in a subject, the system having a first lead electrode operable to be implanted and connected to an implantable medical device, a second lead electrode operable to be implanted and connected to the implantable medical device, and at least two pair of axis electrodes operable to inject two axes of current into the subject, the system further comprising:
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a processor operable to execute instructions to; determine a position of the first electrode and the second electrode based on a determined impedance with the first electrode and the second electrode; selecting a unit vector; project the determined positions of the first electrode and the second electrode onto the selected unit vector; and determine a trend of positions over time of the first electrode and the second electrode for illustration relative to the selected unit vector; and a display device to display the determined trend of positions on the selected unit vector over time including a first icon representing a trace of positions of the first electrode over time and a second icon representing a trace of positions of the second electrode over time; wherein the first icon and the second icon are operable to be viewed to determine synchrony of movement of the structure in the subject. - View Dependent Claims (24, 25)
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Specification