On Saturday, Boston Scientific Corporation BSX unveiled three-year primary endpoint results from the OPTION global clinical trial of the WATCHMAN FLX Left Atrial Appendage Closure (LAAC) Device.The WATCHMAN implant device is about the size of a quarter and shaped like a parachute. It is implanted into the heart to close off the left atrial appendage, a blind pouch of heart tissue to prevent blood clots from forming and causing a stroke.Key findings from the study comparing the device to first-line oral anti ...