Patent ID: 8894588

Claim:
An ablation catheter system with a balloon, comprising: an ablation catheter; a balloon fixed to a front side of the ablation catheter, wherein the balloon is heated for ablation; and a guidewire configured for use with the ablation catheter and the balloon; wherein the guidewire comprises: a deformed portion formed by bending and/or curving the guidewire in a 20 to 100-mm region from an end portion in a longitudinal direction of the guidewire, a guidewire front end straight portion, which has a linear shape, positioned closer to said end portion than the deformed portion of the guidewire wherein, as for the deformed portion, a shortest distance between a central axis in the longitudinal direction of the guidewire and a point farthest away from the central axis in a direction perpendicular to the central axis is equal to or longer than a shortest inner diameter of a lumen of a catheter shaft of the ablation catheter with the balloon to be used with the guidewire and 40 mm or shorter, wherein the deformed portion of the guidewire is configured to prevent the end portion of the guidewire from approaching the front side of the ablation catheter to prevent erroneous heating of the end portion of the guidewire.