US 11,925,409 B2
Devices and methods for treating lung tumors
Dorin Panescu, San Jose, CA (US); Shashank Raina, Santa Clara, CA (US); Mark Gelfand, New York, NY (US); Mark Leung, Duncan (CA); and Simplicio Velilla, Santa Clara, CA (US)
Assigned to ZIDAN MEDICAL INC., New York, NY (US)
Filed by Zidan Medical Inc., New York, NY (US)
Filed on Nov. 3, 2020, as Appl. No. 17/088,051.
Application 17/088,051 is a continuation of application No. 16/521,334, filed on Jul. 24, 2019, granted, now 10,842,560.
Application 16/521,334 is a continuation of application No. PCT/US2018/049991, filed on Sep. 7, 2018.
Claims priority of provisional application 62/650,246, filed on Mar. 29, 2018.
Claims priority of provisional application 62/631,225, filed on Feb. 15, 2018.
Claims priority of provisional application 62/555,675, filed on Sep. 8, 2017.
Claims priority of application No. 201810310511.1 (CN), filed on Apr. 9, 2018.
Prior Publication US 2021/0068895 A1, Mar. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 18/14 (2006.01); A61B 34/20 (2016.01); A61B 18/00 (2006.01); A61B 18/04 (2006.01)
CPC A61B 18/1492 (2013.01) [A61B 34/20 (2016.02); A61B 2018/0022 (2013.01); A61B 2018/00541 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00642 (2013.01); A61B 2018/00791 (2013.01); A61B 2018/00875 (2013.01); A61B 2018/00982 (2013.01); A61B 2018/048 (2013.01); A61B 2018/1425 (2013.01); A61B 2018/1467 (2013.01); A61B 2018/1472 (2013.01); A61B 2034/2051 (2016.02); A61B 2034/2061 (2016.02); A61B 2034/2063 (2016.02); A61B 2218/002 (2013.01); A61B 2218/007 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An ablation catheter assembly configured to ablate tissue in a lung of a patient, the ablation catheter assembly comprising:
a flexible shaft configured to advance endobronchially into an airway of the lung;
an ablation electrode attached to a distal portion of the flexible shaft and configured to deliver radiofrequency (RF) electrical current to the tissue, wherein the ablation electrode is conductively connectable to an RF electrical energy source external to the patient;
a liquid outlet on the distal portion and configured to be in fluid communication with a source of a conductive liquid;
a first occluder attached to the flexible shaft proximal to the ablation electrode and proximal to the liquid outlet;
a suction opening at the distal portion of the flexible shaft, wherein the suction opening is configured to be in fluid communication with a vacuum;
a second electrode on the flexible shaft between the ablation electrode and the first occluder;
an impedance monitoring circuit configured to measure an impedance between the ablation electrode and the second electrode; and
a controller configured to automatically stop suction through the suction opening in response to a reduction of at least five percent in the impedance between the ablation electrode and the second electrode.