Ablation catheter system

摘要

In order to sufficiently cauterize a target site existing in a deep portion of a cardiac muscle tissue even in the case where the fat layer attached to an epicardium is thick or where the cardiac muscle is thickened due to cardiac hypertrophy and the like, provided is an ablation catheter comprising: an elongated catheter main body; an electrode for ablation placed in a leading end part of the catheter main body; and an optical fiber that is placed along a longitudinal direction of the catheter main body, includes an emission end formed on a leading end surface of the catheter main body, and emits a laser beam guided therethrough from the emission end.

主权项

1. An ablation catheter system comprising:
an ablation catheter comprising:
an elongated catheter main body;an optical fiber placed along a longitudinal direction of the catheter main body,
wherein the optical fiber defines an emission end formed on a leading end surface of the catheter main body, andwherein the optical fiber is configured to guide a laser beam having high peak energy and to emit the laser beam guided therethrough from the emission end to ablate a first portion of a target;a cauterization electrode wound around a leading end part of the catheter main body,
wherein the cauterization electrode feeds a high-frequency current to cauterize a second portion of the target; anda pair of biopotential measurement electrodes placed in the leading end part of the catheter main body,
wherein the pair of biopotential measurement electrodes are configured to measure biopotential across the pair of biopotential measurement electrodes; and a controller configured to:
control a laser source that generates the laser beam to control emission of the laser beam from the emission end of the optical fiber; andcontrol a high-frequency power source that supplies the high-frequency current to control feeding of the high-frequency current through the cauterization electrode, based on the biopotential measured across the pair of biopotential measurement electrodes,wherein the controller is configured to control the laser source to generate the laser beam such that the laser beam is emitted from the emission end of the optical fiber in response to a first determination that the biopotential measured across the pair of biopotential measurement electrodes is less than a predetermined threshold, andwherein the controller is configured to control the high-frequency power source to supply the high-frequency current to the cauterization electrode in response to a second determination that the biopotential measured across the pair of biopotential measurement electrodes exceeds the predetermined threshold.