US 12,256,973 B2
Balloon ablation catheter system and method of controlling same
Kota Tsukamoto, Tokyo (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 17/915,052
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Mar. 31, 2021, PCT No. PCT/JP2021/013837
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/201101, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-063087 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0157741 A1, May 25, 2023
Int. Cl. A61B 18/08 (2006.01); A61B 17/00 (2006.01); A61B 18/00 (2006.01); A61B 90/00 (2016.01)
CPC A61B 18/082 (2013.01) [A61B 2017/00199 (2013.01); A61B 2017/00292 (2013.01); A61B 2018/0022 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00648 (2013.01); A61B 2018/00684 (2013.01); A61B 2018/00791 (2013.01); A61B 2090/063 (2016.02); A61B 2090/064 (2016.02)] 5 Claims
OG exemplary drawing
 
1. An ablation catheter system comprising:
a catheter shaft;
a balloon attached to said catheter shaft;
a lumen extending through said catheter shaft in a longitudinal direction thereof and communicating with the interior of said balloon;
a heating electrode and a temperature sensor provided in the interior of said balloon;
a heater that applies electrical energy to said heating electrode;
a pressure sensor;
a balloon volume sensor; and
a processor that calculates the estimated depth of ablation, using as variables, heating temperature of a generator, ablation time of said generator, a value of balloon pressure obtained from said pressure sensor and a value of balloon volume obtained from said balloon volume sensor; wherein said estimated depth of ablation is determined from a reference table based on said heating temperature, said ablation time and said balloon volume, and from a mathematical expression that correlates with said balloon pressure; wherein said mathematical expression is equation (1): D=k * p2+k′*P+t (1) wherein D represents said estimated depth of ablation; each of k and k′ represents the constant of proportionality referenced from said reference table based on said balloon volume, said heating temperature and said ablation time; t represents a constant referenced from said reference table based on said balloon volume, said heating temperature and said ablation time; and P represents the value of said balloon pressure.