US 12,133,723 B2
Position determination system and method
Shai Ronen, Louisville, CO (US); Andrew Bzostek, Erie, CO (US); Brad Jacobsen, Erie, CO (US); and Andrew Wald, Denver, CO (US)
Assigned to Medtronic Navigation, Inc., Lafayette, CO (US)
Filed by Medtronic Navigation, Inc., Louisville, CO (US)
Filed on Aug. 31, 2022, as Appl. No. 17/900,010.
Application 17/900,010 is a continuation of application No. 15/963,444, filed on Apr. 26, 2018, granted, now 11,439,317.
Prior Publication US 2023/0000386 A1, Jan. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/06 (2006.01); A61B 34/20 (2016.01); G01R 33/02 (2006.01); G01R 33/28 (2006.01)
CPC A61B 5/062 (2013.01) [A61B 34/20 (2016.02); G01R 33/0206 (2013.01); G01R 33/287 (2013.01); A61B 2034/2046 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A system to track a member in a volume, comprising:
a transmitter operable to generate an electro-magnetic field at a plurality of frequencies;
a tracking device having at least a first sensor configured to sense the field at each frequency of the plurality of frequencies;
a processor system configured to:
receive a signal regarding the sensed field at the plurality of frequencies,
evaluate the received signal to determine if an interference is present,
if an interference is determined to be present, determine a distortion free flux based on a modeled flux interpolated to zero frequency, and
determine a position of the tracking device based on a distortion free field based on the determined distortion free flux.