MemoPart™ Patent Foramen Ovale (PFO) Occluder MemoPart™ PFO Occluder (PFO) is a percutaneous, transcatheter occluder intended to dose all types Patent Foramen Ovale in patients with a history of stroke or transient ischemic attacks (TIAs). Typical structure A: LA Disc Diameter B: RA Disc Diameter C: Connecting Waist Diameter H: Height of Cconnecting Waist