Therapy™ Cool Flex™ Irrigated Ablation System for Typical Atrial Flutter

Inclusion Criteria: * A signed written Informed Consent * Presence of typical atrial flutter (cavo-tricuspid isthmus dependent) * If subjects are receiving anti-arrhythmic drug therapy (Class I or Class III AAD) for an arrhythmia other than typical atrial flutter, then the subject needs to be controlled on their medication for at least 3 months. If the subject had typical atrial flutter before starting the AAD(s) (Class I or Class III) and then subsequently had another arrhythmia (i.e. atrial fibrillation), then the 3 month AAD criteria will not apply * One documented occurrence of the study arrhythmia documented by ECG, Holter, telemetry strip, or transtelephonic monitor within the past 6 months * In good physical health * 18 years of age or older * Agree to comply with follow-up visits and evaluation Exclusion Criteria: * Prior typical atrial flutter ablation treatment * Pregnancy * Atypical flutter or scar flutter (non isthmus dependent) * Significant coronary heart disease or heart failure; that is unstable angina pectoris and/or uncontrolled congestive heart failure (NYHA Class III or IV) at the time of enrollment * A recent myocardial infarction within 3 months of the intended procedure date * Permanent coronary sinus pacing lead * Clinically significant Tricuspid valvular disease requiring surgery and/or a prosthetic tricuspid heart valve * Evidence of intra-cardiac thrombus or a history of clotting disorders * Participation in another investigational study * Cardiac surgery within 1 month prior to the intended procedure date * Allergy or contraindication to Heparin