Ablation device with multiple ablation modes

摘要

Devices, systems, and methods for performing ablation therapy on body tissue are disclosed. An example ablation device for treating body tissue includes an ionically conductive balloon and a radio-frequency electrode that delivers RF energy into a distal section of the balloon. The balloon is configured to transmit the RF energy in a direction distally towards a leading end of the ablation device. Multiple ablation electrodes on the device can be used for providing lesions of different size or shape.

主权项

1. A system for ablating body tissue, comprising:
an RF generator including a switching mechanism selectively operable between a first position and a second position; a fluid source including a supply of electrically conductive fluid; and an ablation device, including:
an elongate shaft having a proximal section, a distal section, and at least one fluid lumen;an inflatable balloon coupled to the distal section of the shaft and including an interior section in fluid communication with the fluid source for actuating the balloon between a collapsed state and an expanded state;a first electrode disposed within the interior space of the balloon and electrically coupled to the RF generator, the first electrode configured for supplying a first RF electrical field through the balloon and into the body tissue when the switching mechanism is in the first position;a second electrode coupled to a distal end portion of the elongate shaft and electrically coupled to the RF generator, the second electrode configured for supplying a second RF electric field directly into the tissue when the switching mechanism is in the second position;wherein the RF generator is configured to activate either the first electrode, when the switching mechanism is in the first position, or the second electrode, when the switching mechanism is in the second position.