Provided is a radiofrequency
balloon catheter system that allows inflation / deflation of the
balloon in a controlled manner to enable the same to easily pass through the
stenosis site without significantly changing the profile of a
balloon (6). When a
coolant is injected into the inside of the balloon (6), the balloon is inflated while discharging the
coolant to the outside of the balloon (6), thus cooling the balloon (6) while applying a pressure to the balloon (6), with an intima being protected by perfusing the inside of the balloon (6) with a
coolant. The radiofrequency
balloon catheter system comprises a
catheter shaft (1) comprising an inner tube shaft (3) and an outer tube shaft (2) that are slidable with each other; and a resilient balloon (6) that is
inflatable and deflatable and provided between distal ends (4) of the inner tube shaft (3) and the outer tube shaft (2), said balloon (6) covering the inner tube shaft (3). The balloon (6) and the inner tube shaft (3) are in close proximity with each other to define a
check valve (8). When the solution within the balloon (6) is suctioned to turn the pressure inside the balloon (6) to negative, the
check valve (8) is closed and then the balloon (6) is deflated. Also, when a coolant is injected thereinto, the balloon (6) is inflated to open the
check valve (8), thereby discharging the coolant to the outside. The radiofrequency
balloon catheter system further includes an
electrode for delivery of radiofrequency current (11) connected to a
radiofrequency generator via a connecting wire (42) within said
catheter shaft (1); and a solution transport path being in constant communication with an inside of the balloon (6) and connected to a liquid
feed pump (29) for feeding a coolant (C).