The HeartPad^® is not for sale inside or outside the United States. Positioned adjacent to the heart using direct vision, video guidance or in conjunction with cardiac mapping, it will be used for open or minimally invasive ablation procedures. It is intended to ablate relatively large contiguous areas of cardiac tissue, such as atrial and ventricular tissue. Once in position the device is expanded by inflating its pressure-controlled insulation pontoon. This brings the unique ablating surface into contact with an external (epicardial) surface of the heart that is targeted for ablation. System sensors provide data to help direct ablation therapy. Extremely low temperature (“XLT”) helium gas (colder than -250C) is driven through the unique ablating surface, attaching the ablation pad to the heart by a process called cryo-adhesion.  The contacted surface of the heart is ablated while adjacent areas are protected from ablation injury by the insulation pontoon. After ablation is completed warm helium gas is supplied to thaw the ablation pad which reverses the cryo-adhesion and allows re-positioning of the device if additional ablation is required. The HeartPad^® is then withdrawn from the pericardial cavity.