US 9,808,178 B2
Tracking system using field mapping
Doron Harlev, Brookline, MA (US); and Rotem Eldar, Rehovot (IL)
Assigned to Boston Scientific Scimed Inc., Maple Grove, MN (US)
Filed by Boston Scientific Scimed, Inc., Maple Grove, MN (US)
Filed on Sep. 23, 2013, as Appl. No. 14/33,698.
Application 14/033,698 is a continuation of application No. 13/369,787, filed on Feb. 9, 2012, granted, now 8,568,406.
Application 13/369,787 is a continuation of application No. 12/258,677, filed on Oct. 27, 2008, granted, now 8,137,343, issued on Mar. 20, 2012.
Prior Publication US 2014/0024911 A1, Jan. 23, 2014
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/06 (2006.01); A61B 5/053 (2006.01); A61B 34/20 (2016.01); A61B 5/00 (2006.01); A61B 18/14 (2006.01)
CPC A61B 5/065 (2013.01) [A61B 5/053 (2013.01); A61B 5/0536 (2013.01); A61B 5/063 (2013.01); A61B 34/20 (2016.02); A61B 5/7285 (2013.01); A61B 18/1492 (2013.01); A61B 2034/2051 (2016.02)] 11 Claims
OG exemplary drawing
 
1. A method comprising:
determining expected signal measurements of a field inside an organ of a body using a noninterpolation based calculation, the expected signal measurements being based on signals generated by current injecting electrodes that are mounted on a first catheter placed inside the body or body surface electrodes and measured by electrodes on a second catheter; and
determining a position of each of one or more additional electrodes on a third catheter in the organ based on measurements made by the additional electrodes and the determined expected signal measurements of the field;
the method further comprising:
causing current to flow among multiple sets of current injecting electrodes to generate a field in the organ in the body, the multiple sets of current injecting electrodes being secured to one or more stable locations relative to the organ in the body;
obtaining positions within the organ of one or more measuring electrodes used for measuring the field generated by the multiple sets of current injecting electrodes;
in response to the current flow, measuring the field at multiple locations in the organ using the one or more measuring electrodes;
modeling the field using the measurements of the field from the one or more measuring electrodes and the positions within the organ of the one or more measuring electrodes; and
determining the expected signal measurements of the field at additional locations within the organ using the model of the field.