US 12,127,778 B2
Focal pulsed field ablation devices and methods
Mark T. Stewart, Lino Lakes, MN (US); and Brian T. Howard, Hugo, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Jan. 31, 2019, as Appl. No. 16/263,812.
Claims priority of provisional application 62/633,393, filed on Feb. 21, 2018.
Prior Publication US 2019/0254735 A1, Aug. 22, 2019
Int. Cl. A61B 18/12 (2006.01); A61B 18/14 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/1206 (2013.01) [A61B 18/14 (2013.01); A61B 18/1492 (2013.01); A61B 2018/00214 (2013.01); A61B 2018/00351 (2013.01); A61B 2018/00363 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00613 (2013.01); A61B 2018/00744 (2013.01); A61B 2018/00791 (2013.01); A61B 2018/00839 (2013.01); A61B 2018/00875 (2013.01); A61B 2018/00892 (2013.01); A61B 2018/126 (2013.01); A61B 2018/1472 (2013.01); A61B 2218/002 (2013.01); A61B 2218/007 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system for ablating tissue at a treatment site, the system comprising:
an energy delivery device comprising:
a distal tip, the distal tip defining a first plurality of irrigation ports;
an energy delivery electrode, the energy delivery electrode being proximal to the distal tip and defining a second plurality of irrigation ports;
a first chamber in fluid communication with the first plurality of irrigation ports, the first chamber being proximate the energy delivery electrode;
a second chamber having a same diameter as a diameter of the first chamber, the second chamber being in fluid communication with the second plurality of irrigation ports, the first chamber being disposed proximate the second chamber;
a control unit including:
a first source of first impedance-modifying fluid in fluid communication with only the first plurality of irrigation ports;
a second source of second impedance-modifying fluid in fluid communication with only the second plurality of irrigation ports, wherein the first impedance-modifying fluid is a hypertonic fluid and the second impedance-modifying fluid is a hypotonic fluid;
an energy generator in electrical communication with the energy delivery electrode, the energy generator being configured to transmit energy to the energy delivery electrode and the energy delivery electrode being configured to deliver energy to the treatment site; and
processing circuitry configured to control delivery of the impedance-modifying fluid from the first source and the second source to the energy delivery device.