Patent ID: 8887736
Filing Date: 2014-11-18
Classification: A61B,G06T

Abstract:
1. A system to determine a position of an elongated member in a volume filled with a conductive medium, comprising: a position sensing unit, including: at least three sets of axis electrodes operable to be positioned on a surface of the volume, a driver to inject a current between each of the sets of axis electrodes to generate three substantially orthogonal axes of current within the volume of a heart, and a processor; an elongated conductive member extending to a distal end and operable to extend from an insertion point to a position within the heart; and a display device operable to display a determined position of the elongated member within the heart; wherein the processor is operable to determine a single value of an electrical property along a length of the elongated conductive member between the insertion point and the distal end, said elongated conductive member having an exposed conductive surface which varies in size when the elongated conductive member is moved from a first extended position to a second extended position; wherein the processor is further operable to determine a position within the heart related to the single value; wherein the processor is further operable to determine a position of a center of the elongated conductive member between the insertion point and the distal end based on the determined position; and wherein the processor is further operable to determine a position of a distal end of the elongated conductive member based on both the determined insertion point and the determining a position of a center of the elongated conductive member.