Business: NMT Medical designs, develops and markets proprietary implant technologies that allow interventional cardiologists to treat cardiac sources of stroke and other potential brain attacks through minimally invasive, catheter-based procedures. NMT Medical is investigating the potential connection between a common cardiac defect called a patent foramen ovale (PFO) and brain attacks such as stroke, transient ischemic attacks (TIA's) and migraine headaches. A PFO can allow venous blood, unfiltered by the lungs, to enter the arterial circulation of the brain possibly triggering a cerebral event or brain attack. NMT is a leader in designing and developing implants to seal the PFO defect in a minimally invasive, catheter-based procedure performed by the interventional cardiologist.