BALLOON CATHETER ABLATION SYSTEM

摘要

A balloon catheter ablation system having a balloon (6) at a distal end of a catheter shaft (1). An electrode (11) for delivery of radiofrequency current and a temperature sensor (12) are arranged inside the balloon (6), Bipolar electrode pair (16a, 16b) are arranged on the outside of the balloon (6), with the balloon (6) sandwiched therebetween. When a fluid is injected into the inside of the balloon (6) by using a syringe (24), the balloon (6) expands and comes in close contact with a target site (S) of tissue. A vibration generator (25) agitates the fluid inside the balloon (6) by using vibration. A radiofrequency generator (31) conducts electricity between the electrode (11) for delivery of radiofrequency current and a counter electrode (13) and heats the fluid inside the balloon (6). Accordingly, the balloon (6) ablates the target site (S). The impedance between the bipolar electrode pair (16a, 16b) decreases as the ablation progresses. Accordingly, the progress of the ablation can be ascertained from the measurement results of an electrical impedance measuring potential amplifier (41).

主权项

1. A balloon catheter ablation system comprising:
a catheter shaft comprising an inner tube and an outer tube which are slidable to each other; a balloon provided between distal ends of said inner tube and said outer tube said balloon being elastic; an electrode for delivery of radiofrequency current and a temperature sensor, both being provided within said balloon; a radiofrequency generator and a thermometer respectively connected to said electrode for delivery of radiofrequency current and said temperature sensor via a first electric wire; a solution transport path defined by said outer tube and said inner tube, said solution transport path being in communication with an inside of said balloon; a syringe for deflating and inflating said balloon and a vibration generator for agitating the inside of said balloon, said syringe and said vibration generator each connected to said solution transport path; a bipolar electrode pair provided on the outside of said balloon, with said balloon sandwiched therebetween; and an electric impedance measuring multimeter and a potential amplifier, each connected to said bipolar electrode pair via a second electric wire, wherein said bipolar electrode pair includes: a first balloon catheter anterior electrode arranged at a distal end of a balloon catheter, composed of said balloon and said catheter shaft; and a second balloon catheter anterior electrode placed behind said balloon.