Patent ID: 8355774
Filing Date: 2013-01-15
Classification: A61B,A61N

Abstract:
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.