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The objective of this study is to investigate whether percutaneous PFO closure with the Occlutech Flex II PFO Occluder is non-inferior to the AMPLATZER™ PFO Occluder and Gore® Cardioform Septal Occluder in closure of the PFO, prevention of recurrent embolic stroke, and device/procedure related Serious Adverse Events (SAE)

Abbott developed the AMPLATZER™  PFO Occluder as a minimally invasive, transcatheter PFO closure treatment to further reduce the risk of recurrent stroke among patients with PFO and cryptogenic stroke beyond that achieved with medical management. This additional risk reduction is achieved by blocking the pathway for a venous embolism from reaching the body's arterial system and the brain.