Patent ID: 9131869
Filing Date: 2015-09-15
Classification: A61B

Abstract:
1. A method comprising: causing current to flow among multiple current injecting electrodes, at least some of the current injecting electrodes being placed in stable locations relative to a patient's body to generate a field in an organ; in response to the current flow caused by the current injecting electrodes placed in stable locations relative to the patient's body, measuring a signal at each of multiple measuring electrodes on a catheter for each of multiple locations of the catheter to generate information about fields measured at each of the multiple locations; determining local field maps, wherein each of the local field maps is based on the measured signals for the catheter at a location corresponding to the local field map and characterized by a field function, of potential distribution on a closed surface around the location to points inside the closed surface, that is determined from the measured signals at the location; subsequent to determining the local field maps, determining a combined model of a field that includes expected signals at additional locations within the organ based on the measured signals by: subsequent to determining the combined model of the field, determining a position of at least one electrode selected from the group consisting of at least one of the measuring electrodes of the catheter and a measuring electrode of another catheter in the organ based on at least measurements made by the at least one electrode and the combined model of the field that includes the expected signals.