Patent ID: 8615287

Claim:
A method for determining information about a location and orientation of a catheter in a patient's heart, the method comprising: determining electrical signals as a function of relative position based on spatial information indicative of regions of different complex conductivity in the patient's heart cavity and conductivity values; causing current to flow between each of three or more sets of current-injecting electrode source/sink pairs on a catheter inserted into the patient's heart; measuring by multiple measuring electrodes located on the catheter, electrical signals in response to the current flow caused by each set of current injecting electrode source/sink pairs on the catheter; determining the location and orientation of the catheter in the patient's heart based on the electrical signals measured by the multiple measuring electrodes located on the catheter in response to the current flow caused by the current injecting electrode source/sink pairs on the catheter and the determined electrical signals based on the spatial information; measuring, by at least some of the multiple measuring electrodes on the catheter, electrical signals indicative of cardiac electrical activity; and determining information about electrical activity of the heart based on the measured electrical signals indicative of cardiac electrical activity and the determined location and orientation of the catheter in the patient's heart; wherein causing the current to flow comprises injecting the current at frequencies spaced from those corresponding to the cardiac electrical activity and the determining the location and orientation of the catheter comprises frequency processing the measured electrical signal responsive to the injected current to distinguish electrical signals responsive to the injected current from those corresponding to the cardiac electrical activity.