Patent ID: 8571647
Filing Date: 2013-10-29
Classification: A61B

Abstract:
1. A method comprising: inserting a catheter into a heart, the catheter comprising three or more electrodes; causing the catheter to move to each of multiple, different positions in the heart; for each of the multiple, different catheter positions, causing current to flow between at least some of the electrodes and in response to current flow, measuring an electrical signal at each of one or more of the electrodes; and subsequent to causing current flow and measuring the electrical signals at the multiple, different catheter positions, determining anatomical information about the heart based on positions of the catheter electrodes at a plurality or the multiple, different catheter positions, the measured signals at the plurality of the multiple, different catheter positions, and a surface location threshold applied to a measure related to a distance between a surface of the heart and the catheter; wherein determining the anatomical information based on the measured signals further compromise: distinguishing electrical signals indicative of cardiac electrical activity from those responsive to the injected current; and determining the anatomical information based on the electrical signals responsive to the injected current.