Some embodiments of the invention relate to a system for treating tissue internal to a body, such as heart tissue. For example, the system may be used to ablate tissue as a treatment for atrial fibrillation. In certain embodiments, the system is capable of causing scar tissue to form in ostial areas...http://www.google.es/patents/US8123741?utm_source=gb-gplus-sharePatente US8123741 - Treating internal body tissue
