US 12,446,955 B2
Variable impedance paths for delivery of electric fields
Brian T. Howard, Minneapolis, MN (US); Steven J. Fraasch, Maple Grove, MN (US); Gonzalo Martinez, Mendota Heights, MN (US); Mark T. Stewart, Lino Lakes, MN (US); Sara A. Frantz, Mounds View, MN (US); and Lars M. Mattison, St. Anthony, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Mar. 1, 2022, as Appl. No. 17/683,635.
Claims priority of provisional application 63/156,540, filed on Mar. 4, 2021.
Prior Publication US 2022/0280229 A1, Sep. 8, 2022
Int. Cl. A61B 18/14 (2006.01); A61B 18/12 (2006.01); H03H 1/00 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/1492 (2013.01) [A61B 18/1206 (2013.01); H03H 1/00 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/0072 (2013.01); A61B 2018/00732 (2013.01); A61B 2018/00767 (2013.01); A61B 2018/00875 (2013.01); A61B 2018/1253 (2013.01); A61B 2018/126 (2013.01); A61B 2018/1407 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A method in a pulsed field ablation (PFA) system having a plurality of electrodes for delivering an electric field to patient tissue, a PFA generator for generating excitation voltages, and a catheter electrode distribution system (CEDS) configured to distribute the excitation voltages to the plurality of electrodes, the method comprising:
determining a current for each of a plurality of circuit paths, each circuit path including two electrodes, each current being determined based at least in part on:
a desired voltage between the two electrodes;
a tissue impedance between the two electrodes; and
a parasitic impedance associated with the circuit path; and
determining an excitation voltage and an input resistance for each circuit path of the plurality of circuit paths based on the determined current for the circuit path, parasitic impedances associated with the circuit path, and a tissue impedance between the two electrodes in the circuit path.